Babbie, Earl, author
The practice of social research
Cengage Learning, 2016
 Buku Teks
Babbie, Earl, author
The practice of social research
Wadsworth and Cengage Learning, 2013
 Buku Teks
Judd, Charles M., author
Research methods in social relations
Methuen, 1991
 Buku Teks
Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
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Lee, Raymond M., author
Unobtrusive methods in social research
Open University Press, 2000
 Buku Teks
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