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
editor, Harry Helms [and others]
McGraw-Hill, 1983
Buku Referensi
William J. Hardcastle, John Laver, Fiona E. Gibbon, editor
Wiley-Blackweell, 2013
Buku Teks