Barnes, R.S.K.
Blackwell Scientific Publications, 1988
Buku Teks
Odum, Eugene Pleasants
Saunders College, 1983
Buku Teks
Brewer, Richard
Saunders College Publishing, 1994
Buku Teks
Ehrlich, Paul R.
Macmillan, 1987
Buku Teks
Kormondy, Edward J.
Prentice-Hall, 1976
Buku Teks