University Tutorial Press , 1977
Buku Teks
Dillon, Lawrence S.
Macmillan Company, 1966
Buku Referensi
Breneman, W.R., author
Xerox College Publishing, 1959
Buku Teks
Rineka Cipta, 1995
Buku Referensi
Mayr, Ernst, author
Harvard University Press, 1999
Buku Teks