edited by Andrew Dawson
Routledge, 2016
Buku Teks
Ray, James Lee
Houghton Mifflin, 1987
Buku Teks
Kaarbo, Juliet
Wadsworth, Cengage Learning, 2011
Buku Teks
Lipschutz, Ronnie D.
Routledge, 2005
Buku Teks
edited by Larry W. Bowman and Ian Clark
Westview Press, 1981
Buku Teks