Babbie, Earl, author
The practice of social research
Cengage Learning, 2016
 Buku Teks
May, Tim, author
Social research / Tim May
Open University Press, 2001
 Buku Referensi
Lee, Raymond M., author
Unobtrusive methods in social research
Open University Press, 2000
 Buku Teks
Babbie, Earl, author
Social research counts
Wadsworth and Cengage Learning, 2013 (Student Edition)
 Buku Teks
Babbie, Earl, author
Social research counts
Wadsworth and Cengage Learning, 2013 (International edition)
 Buku Teks
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