Ewen, Dale
Prentice-Hall, 1983
Buku Teks SO
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
Hirst, D.M.
Macmillan, 1976
Buku Teks SO