Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Dobelstein, Andrew W., author
Thomson Brooks/Cole, 2003
Buku Teks
edited by Thomas and Dorothy Wilson
Longman, 1991
Buku Teks
editor, Gabriele Koehler, Deepta Chopra
Routledge, 2014
Buku Teks
Dinitto, Diana M., author
Prentice-Hall, 2000
Buku Teks