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| Author | Title | Year  |
Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Stoinski, T.S.; Whiten, A. | Social learning by orangutans (Pongo abelii and Pongo pygmaeus) in a simulated food-processing task | 2003 | Journal of comparative psychology (Washington, D.C. : 1983) | 737 | 117 | 272-282 |
| Vonk, J. | Gorilla ( Gorilla gorilla gorilla) and orangutan ( Pongo abelii) understanding of first- and second-order relations | 2003 | Animal Cognition | 2578 | 6 | 77-86 |
| Morton, D.B. | Self-consciousness and animal suffering | 2000 | Biologist (London, England) | 618 | 47 | 77-80 |
| Galdikas, B.M. | Orangutan tool use | 1989 | Science (New York, N.Y.) | 2847 | 243 | 152 |