Babbie, Earl
The practice of social research
Wadsworth and Cengage Learning, 2013
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Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
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Judd, Charles M.
Research methods in social relations
Methuen, 1991
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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Babbie, Earl
Social research counts
Wadsworth and Cengage Learning, 2013 (International edition)
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