Ivey, Allen E.
Allyn and Bacon, 1996
Buku Teks SO
edited by Roy Moodley, Stephen Palmer
Routledge, 2006
Buku Teks SO
Sage Publications, 2017
eBooks
edited by Freddy A. Paniagua, Ann-Marie Yamada
Academic Press, 2013
eBooks
Levey, Samuel
J.B. Lippincott, 1973
Buku Teks