The Encyclopaedia of animal ecology and evolution
edited by Peter Moore, R.J. Berry and A. Hallam
Grolier International, 1993
 Buku Referensi
McFarland, David
Animal behaviour : psychobiology, etnology, and evolution
Longman, 1993
 Buku Teks
Tullar, Richard M.
The Human species : its nature, evolution, and ecology
McGraw-Hill, 1977
 Buku Teks
The Encyclopedia of animal evolution / edited by R.J. Berry and A. Hallam
Facts on file, 1989
 Buku Teks
The units of evolution : essays on the nature of species / edited by Marc Ereshefsky
Massachusetts The MIT Press, 1992
 Buku Teks