by Harvey Checkoway, Neil Pearce, Douglas J. Crawford-Brown
Oxford University Press, 1989
Buku Teks
by William G. Zikmund ... [and others]
South-Western Cengage Learning, 2013
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Wiersma, William, author
Pearson, 2009
Buku Teks
Bhattacharyya, Dipak Kumar, author
Oxford University Press , 2014
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Lamont, Christopher K., author
Sage Publications Ltd., 2015
Buku Teks