Clinard, Marshall B. (Marshall Barron)
Sage Publications, 1985
Buku Teks
Judson, Karen, 1941-
McGra-Hill Connect Learn Succeed, 20103
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Rezaee, abihollah
John Wiley & Sons, 2009
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Barrett, Brenda
M&E Handbook Series, 1995
Buku Teks
edited by Donald Earl Childress III
Cambridge University Press, 2014
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