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Sage, 2012
Buku Teks
Babbie, Earl R.
The Practice of social research
Wadsworth, 1991
Buku Teks SO
Babbie, Earl R.
The Practice of social research
Wadsworth, 1998
Buku Teks SO
Babbie, Earl R.
The practice of social research
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Babbie, Earl R.
The practice of social research
Wodsworth, 1986
Buku Teks SO