The great apes : between two worlds / photographs and essays by Michael Nichols ; contributions by Jane Goodall, George B. Schaller, Mary G. Smith ; prepared by the Book Division, National Geographic Society.

Orangutans : geographic variation in behavioral ecology and conservation
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The ape's reflexion
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Among orangutans : red apes and the rise of human culture
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The mentality of apes
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The mentality of apes
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Nature. Kusasi & Snowflake.
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The orangutans
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In search of the red ape
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The talking ape
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Photographic and descriptive musculoskeletal atlas of orangutans : with notes on the attachments, variations, innervation, function and synonymy and weight of the muscles
by: Diogo, Rui
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The Neglected ape
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Our vanishing relative : the status of wild orang-utans at the close of the twentieth century
by: Rijksen, H. D.
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The red ape : orang-utans and human origins
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Orang-utan behavior
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The orang-utan, its biology and conservation
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Orangutan : orphans of the forest
by: Borner, Monica
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Folk physics for apes : the chimpanzee's theory of how the world works
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Intelligenzprüfungen an Menschenaffen. : Unveränderter Nadruck der 2. durchgesehenen Aufl. der "Intelligenzprüfungen an Anthropoiden I"aus den Abhandlungen der Preuss. Akademie der Wissenschaften Jahrgang 1917, Physikal. -Mathem. Klasse, Nr. 1, 1921
by: Köhler, Wolfgang, 1887-1967
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Orang-utan.
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In the realm of the red ape
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Among the great apes : adventures on the trail of our closest relatives
by: Raffaele, Paul
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The last stand of the orangutan : state of emergency : illegal logging, fire and palm oil in Indonesia's national parks
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Orang-Utans und Bonobos im Spiel : Untersuchungen zum Spielverhalten von Menschenaffen
by: Becker, Clemens, 1954-
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Men and apes
by: Morris, Ramona
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Anatomical observations on a collection of orang skulls from western Borneo; with a bibliography
by: Hrdlička, Aleš, 1869-1943

Problemlöseverhalten von Orang-Utans (Pongo pygmaeus)
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Apes.
by: Kay, Helen, 1912-2002
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In the realm of the red ape
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Apes of the impenetrable forest : the behavioral ecology of sympatric chimpanzees and gorillas
by: Stanford, Craig B. (Craig Britton), 1956-
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The lesser apes : evolutionary and behavioural biology
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The Great apes of Africa : proceedings of a symposium held at the Centre international de récherche médicale de Franceville, Gabon, West Africa, December 1979
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The Great apes
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Great ape societies
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The great apes : our face in nature's mirror
by: Leach, Michael
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Patterns of injury and illness in great apes : a skeletal analysis
by: Lovell, Nancy C.
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The great apes ; the natural life of chimpanzees, gorillas, orangutans, and gibbons
by: Gray, Robert, 1922-2002
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