GOODALL J.L. 
- In the shadow of man. 
Boston, Houghton Mifflin, 1971

KORTLAND A.
- New perspectives on ape and human evolution. 
Amsterdam, Stichting voor Psychobiology, 1972

KUMMER H.
- Primate societies. 
Chicago, Aldine, 1971 

LE GROS CLARK W.E.
- History of the primates. 
London, British Museum (Natural History), 1949

NAPIER J. AND NAPIER P.
- Handbook of living primates. 
London, Academic Press, 1967

REYNOLDS V.
- The apes. 
New York, E.P. Dutton, 1967

SCHALLER G.B.
- The mountain gorilla. 
Chicago, Chicago University Press, 1963

SCHALLER G.B.
- The Serengeti lion. 
Chicago, Chicago University Press, 1972

SCHULTZ A.
- The life of primates. 
New York, Universe Books, 1969

SIMONS E.L. 
- Primate evolution. 
New York, Macmillan, 1972