Germain, Carel Bailey
Columbia Universary Press, 1991
Buku Teks
Ashford, Jose B., author
Wadsworth, 2001
Buku Teks
Ashford, Jose B., author
Cengage Learning, 2018
Buku Teks
Longres, John F.
F.E. Peacock Publisher, Inc, 1990
Buku Teks
Zastrow, Charles, author
Nelson-Hall Publishers, 1989
Buku Teks