Drummond, Michael
Oxford University Press, 2010
Buku Teks SO
Drummond, Michael F.
Oxford University Press, 2006
Buku Teks SO
Wonderling, David
Open University Press, 2005
Buku Teks SO
Hicks, Lanis L.
Jones & Bartlett Learning, 2014
Buku Teks SO
Sorkin, Alan L.
Massachusetts Lexington Books, 1984
Buku Teks SO