Gormally, John
Prentice-Hall, 2000
Buku Teks
Kaliski, Burton S.
Harcourt Brace Jovanovich, 1982
Buku Teks
Russell, Bertrand, 1872-1970
George Allen and Unwin, 1956
Buku Teks SO
Novak, David
D.C. Health , 1989
Buku Teks SO
Tomasowa, Francien Herlen
Lembaga Penerbitan Fakultas Pertanian Universitas Brawijaya, 2004
Buku Teks SO