Babbie, Earl R.
The practice of social research
Wodsworth, 1986
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Babbie, Earl R.
The Practice of social research
Wadsworth, 1991
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Babbie, Earl R.
The Practice of social research
Wadsworth, 1998
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Babbie, Earl R.
The practice of social research
Wadsworth, 1975
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Babbie, Earl R.
The practice of social research
Cengage Learning, 2016
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