Klesner, Joseph L.
McGrawHill education, 2014
Buku Teks SO
Kesselman, Mark
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Christian Soe
McGraw-Hill, 2004
Buku Teks SO
Barringron, Lowell
Wadsworth and Cengage Learning, 2013
Buku Teks SO
edited by Howard J. Wiarda
Westview Press, 1985
Buku Teks SO