Norstog, Knut, author
Northern Illinois University, 1969
Buku Teks
Wiley, E.O., author
John Wiley & Sons, 1981
Buku Teks
edited by David J. Galloway
Clarendon Press, 1991
Buku Teks
Crawford, Daniel J., author
John Wiley & Sons, 1990
Buku Teks
Cibas, Edmun S., author
PA Elsevier Saunders, 2014
Buku Teks