Wiarda, Howard J., author
Thomson Wadsworth, 2000
Buku Teks
Klesner, Joseph L., author
McGrawHill education, 2014
Buku Teks
Kesselman, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Christian Soe
McGraw-Hill, 2004
Buku Teks
Barringron, Lowell, author
Wadsworth and Cengage Learning, 2013
Buku Teks