Shumway, Waldo, author
John Wiley & Sons, 1954
Buku Teks
Walker, Warren F.
Saunders College Pub., 1986
Buku Referensi
Caughley, Graeme, author
John Wiley & Sons, 1980
Buku Teks
editors, Norman K. Wessells, Elizabeth M. Center
William Kaufmann, 1973
Buku Teks
Rugh, Roberts, author
Burgess, 1961
Buku Teks