Peterson, Veronica
Elsevier Mosby, 2013
Buku Teks
Barash, Paul G.
Lippincott - Raven Publishers, 1997
Buku Referensi
edited by W.A. Paton
Ronald Press, 1955
Buku Teks
Prentice-Hall, 1991
Buku Referensi
Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
Buku Referensi