Gehart, Diane R, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Welfel, Elizabeth Reynolds, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Glicken, Morley D., author
Elsevier , 2009
Buku Teks
edited by I. Bruna Seu, M. Colleen Heenan
Sage, 1998
Buku Teks
Crain, William C, author
Prentice-Hall, 2005
Buku Teks