Babbie, Earl R., author
The practice of social research
Cengage Learning, 2016
 Buku Teks
Babbie, Earl R., author
The Practice of social research
Wadsworth, 1991
 Buku Teks
Babbie, Earl R., author
The Practice of social research
Wadsworth, 1998
 Buku Teks
Judd, Charles M., author
Research methods in social relations
Methuen, 1991
 Buku Teks
Babbie, Earl R., author
Social research counts
Wadsworth and Cengage Learning, 2013 (International edition)
 Buku Teks
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