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Palgrave Macmillan, 2009
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Babbie, Earl R.
The practice of social research
Wadsworth, 2010
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Babbie, Earl R.
The practice of social research
Thomson/Wadsworth, 2004
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Babbie, Earl R.
The practice of social research
Wodsworth, 1986
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Babbie, Earl R.
The Practice of social research
Wadsworth, 1991
Buku Teks SO