Watson, David L., author
Brooks/Cole , 1985
Buku Teks
Watson, David L., author
Wadsworth, 2014
Buku Teks
Adams, Kathleen
Warner Books, 1990
Buku Teks
Duffy, Karen G., author
Pearson Education, Inc., 2005
Buku Teks
Duffy, Karen G., author
New Jersey, 2005
Buku Teks