Pianka, Eric R.
Harper & Row, 1988
Buku Teks
edited by Bernard Stonehouse and Christopher M. Perrins
University Park Press, 1979
Buku Teks
edited by J.R. Krebs and N.B. Davies
Blackwell, 1995
Buku Teks
McGrath, Robert E.
American Psychological Association, cop, 2011
Buku Teks
Tsischitzis, Dionysios C.
Prentice-Hall, 1982
Buku Teks