Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
Buku Teks
Vicki Smith, Patrizia Collard, Paula Nicolson, Rowan Bayne
Mc Graw-Hill, 2012
Buku Teks
Singer, Erwin
Random House, 1965
Buku Teks
Wolberg, Lewis R.
Grune & Stratton, 1965
Buku Teks
Sage Publications, 2002
Buku Teks