© 1981 Markus Kappeler

ALDRICH-BLAKE, F.P.G.: Dispersion and food availability in Malaysian forest primates; in CHIVERS & HERBERT Recent advances in primatology, vol.1, pp. 323-325 (Academic Press, London 1978).

ALTMANN, J.: Observational study of behaviour: sampling methods. Behaviour 49: 227-267 (1974).

ANDREWS, P. & GROVES, C.P.: Gibbons and brachiation; in RUMBAUGH Gibbon and siamang, vol.4, pp. 167-218 (Karger, Basel 1976).

BALDWIN, L.A. & TELEKI, G.: Patterns of gibbon behaviour on Hall's Island, Bermuda: a preliminary ethogram for Hylobates lar; in RUMBAUGH Gibbon and siamang, vol.4, pp. 21-105 (Karger, Basel 1976).

BAUCHOP, T. & MARTUCCI, R.W.: Ruminant-like digestion of the langur monkey. Science 161: 698-700 (1968).

BLOWER, J.H. & VAN DER ZON, A.P.M.: Proposed National Park Ujung Kulon: management plan 1977/78 - 1981/82. FAO(UNDP)-report, project INS/73/013 (1977).

BROCKELMANj W.Y., DAMMAN, D., THONGSUK, P. & SRIKOSAMATARA, S.: Pileated gibbon survey at Khao Soi Dao Sanctuary, Thailand. Tigerpaper 5: 13-15 (1977).

CARPENTER, C.R.: A field study in Siam of the behaviour and social
relations of the gibbon (Hylobates lar). Comp.Psychol.Monogr. 16: 1-212 (1940).

CARPENTER, C.R.: Suspensory behaviour of gibbons Hylobates lar,
a photoessay; in RUMBAUGH Gibbon and siamang, vol.4, pp. 1-20 (Karger, Basel 1976).

CHIVERS, D.J.: The siamang in Malaya: a field study of a primate in tropical rain forest. Contrib.Primatol. 4: 1-335 (1974).

CHIVERS, D.J.: The lesser apes; in RAINIER & BOURNE Primate conservation, pp. 539-598 (Academic Press, London 1977).

CHIVERS, D.J.: The feeding behaviour of siamang (Symphalangus syndactylus); in CLUTTON-BROCK Primate ecology, pp. 355-382 (Academic Press, London 1977a).

CHIVERS, D.J. & HLADIK, C.M.: Morphology of the gastro-intestinal tract in primates: comparison with other mammals in relation to diet. ? (1980).

CHIVERS, D.J., RAEMAEKERS, J.J. & ALDRICH-BLAKE, F.P.G.: Longterm observations of siamang behaviour. Folia primatol. 23: 1-49 (1975).

CLUTTON-BROCK, T.H.: Methodology and measurement; in CLUTTON-BROCK Primate ecology: studies in feeding and ranging behaviour in lemurs, monkeys and apes, pp. 585-590 (Academic Press, London 1977).

DELACOUR, J.: On the Indochinese gibbons (Hylobates concolor). J. Mammalogy 14: 71-73 (1933).

DEMARS, C. & GOUSTARD, M.: Le «grand chant» d'Hylobates concolor leucogenys: comparison avec les emissions sonores homologues d'Hylobates concolor gabriellae et d'Hylobates klossii (iles Mentawai, Ouest Sumatra). Behaviour 65: 1-26 (1978).

ELLEFSON, J.O.: A natural history of white-handed gibbons in the Malayan peninsula; doctoral diss., univ. of California, California (1967).

ELLEFSON, J.O.: Territorial behaviour in the common white-handed gibbon, Hylobates lar LINN; in PHILLIPS & JAY Studies in adaptation and variability, pp. 180-199 (Holt, New York 1968).

GITTINS, S.P.: The behaviour and ecology of the agile gibbon (Hylobates agilis); unpubl. doctoral diss., univ. of Cambridge, Cambridge (1979).

GRAND, T.I.: Gibbon feeding on terminal twigs. J.Mammalogy 53: 197-201 (1972).

GROVES, C.P.: Systematics and phylogeny of gibbons; in RUMBAUGH Gibbon and siamang, vol.1, pp. 1-89 (Karger, Basel 1972).

GRZIMEK, B.: Grzimek's Tierleben; vol.7&8 (Kindler, Zürich 1973).

HALDER, U.: Ökologie und Verhalten des Banteng, Bos javanicus, in Java. Mammalia depicta 10: 1-124 (1976).

HLADIK, A.: Phenology of leaf production in rain forest of Gabon: distribution and composition of food for folivores; in MONTGOMERY The ecology of arboreal folivores, pp. 51-71 (Smithsonian, Washington D.C. 1978).

HLADIK, C.M., HLADIK, A., BOUSSET, J., VALDEBOUZE, P., VIROBEN, G. & DELORT-LAVAL, J.: Le regime alimentaire des primates de l'ile de Barro-Colorado (Panama). Folia primatol. 16: 85-122 (1971).

HOOGERWERF, A.: Ujung Kulon, the land of the last Javan rhinoceros (E.J.Brill, Leiden 1970).

JANZEN, D.H.: Complications in interpreting the chemical defenses of trees against tropical arboreal plant-eating vertebrates; in MONTGOMERY The ecology of arboreal folivores, pp. 73-84 (Smithsonian, Washington D.C. 1978).

KAPPELER, M.: The Javan silvery gibbon (Hylobates lar moloch): habitat, distribution, numbers; unpubl. doctoral diss. (part 1), univ. of Basel, Basel (1981).

LAMPRECHT, J.: Duettgesang beim Siamang, Symphalangus syndactylus
(Hominoidea, Hylobatinae). Z.Tierpsychol. 27: 186-204 (1970).

LORENZ, K.: Über die Bildung des Instinktbegriffes; in LORENZ Über tierisches und menschliches Verhalten, gesammelte Abhandlungen, vol.1 (Piper, München 1965).

LORENZ, R.: The functional interpretation of the thumb in the Hylobatidae. Proc.3rd int.Congr.Primat., Zurich 1970 1: 130-136 (1971).

MacKINNON, J.R.: A comparative ecology of Asian apes. Primates 18: 747-772 (1977).

MacKINNON, J.R. & MacKINNON, K.S.: Comparative feeding ecology of six sympatric primates in West Malaysia; in CHIVERS & HERBERT Recent advances in primatology, vol.1, pp. 305-321 (Academic Press, London 1978).

MARLER, P. & TENAZA, R.R.: Signaling behavior of wild apes with special reference to vocalizations; in SEBEOK How animals communicate, pp. 965-1033 (Indiana Univ. Press, 1977).

MARSHALL, J.T.: Natural history of gibbons; unpubl. manuscript (1972).

MARSHALL, J.T. & MARSHALL, E.R.: Gibbons and their territorial songs. Science 193: 235-237 (1976).

McCANN, C.: Notes on the colouration and habits of the white-browed gibbon or hoolock. J.Bombay Natur.Hist.Soc. 36: 395-405 (1933).

NAPIER, J.R. & NAPIER, P.H.: A handbook of living primates (Academic Press, London 1967).

RAEMAEKERS, J.J.: Gibbons and trees: comparative ecology of the siamang and lar gibbons; unpubl. doctoral diss., univ. of Cambridge, Cambridge (1977).

SATMOKO, R.K.P.: Ujung Kulon Nature Park, Java. Malay.Nat.J. 21: 107-124 (1961).

SCHENKEL, R. & SCHENKEL-HULLIGER, L.: The Javan rhinoceros (Rh. sondaicus Desm.) in Ujung Kulon Nature Reserve: its ecology and behaviour. Acta Tropica 26: 97-135 (1969).

SCHENKEL, R., SCHENKEL-HULLIGER, L. & WIDODO, S.R.: Area management for the Javan rhinoceros (Rhinoceros sondaicus Desm.): a pilot study. Malay.Nat.J. 31: 253-275 (1978).

TEMBROCK, G.: Sound production of Hylobates and Symphalangus; in RUMBAUGH Gibbon and siamang, vol.3, pp.176-205 (Karger, Basel 1974).

TEMBROCK, G.: Phonetische Eigenschaften von Primatenlauten im Evolutions-Aspekt. N.Acta Leopoldina 42: 343-353 (1975).

TENAZA, R.R.: Territory and monogamy among Kloss' gibbons (Hylobates klossii) in Siberut Island, Indonesia. Folia primatol. 24: 60-80 (1975).

TENAZA, R.R.: Songs, chorusses and countersinging of Kloss' gibbons (Hylobates klossii) in Siberut Island, Indonesia. Z. Tierpsychol. 40: 37-52 (1976).

TUTTLE, R.H.: The way apes walk: the problem of human origin. Science 5: 2-8 (1969).

TUTTLE, R.H.: Functional and evolutionary biology of hylobatid hands and feet; in RUMBAUGH Gibbon and siamang, vol.1, pp. 136-206 (Karger, Basel 1972).

WHITMORE, T.C.: Tropical rain forest of the Far East (Clarendon, Oxford 1975).

WHITTEN, A.J.: The Kloss' gibbon in Siberut rain forest; unpubl. doctoral diss., univ. of Cambridge, Cambridge (1980).

WILSON, C.C. & WILSON, W.L.: Methods for censusing forest-dwelling primates; in Contemporary primatology - 5th Int.Congr.Primat. Nagoya 1974, pp. 345-350 (Karger, Basel 1975).