Whitaker, Carl A.
The Blakiston Company, 1953
Buku Teks
Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
Buku Teks
Weisz, John R., author
Cambridge University Press, 2004
Buku Teks
Vicki Smith, Patrizia Collard, Paula Nicolson, Rowan Bayne
Mc Graw-Hill, 2012
Buku Teks
Singer, Erwin
Random House, 1965
Buku Teks