1. A survey of living primates and their anatomy;Ankel-Simons,1983
2. Bayley Scales of Infant Development;Bayley,1969
3. A systems approach to the organizing effects of self-produced locomotion during infancy;Bertenthal,1990
4. Peripartuitional behavior of a bonobo;Bolser;American Journal of Primatology,1989
5. Humans and apes are genetically very similar;Bruce;Nature,1978