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