Babbie, Earl, author
The practice of social research
Wadsworth, 2010
 Buku Teks
Steward, Julian H., author
Area research: theory and practice
Social Science Research Council, 1950
 Buku Teks
Babbie, Earl, author
The practice of social research
Thomson/Wadsworth, 2004
 Buku Teks
Psychotherapy : practice, research, policy
edited by Gary R. Vandenbos
Sage, 1980
 Buku Teks
Babbie, Earl, author
The practice of social research
Wadsworth and Cengage Learning, 2013
 Buku Teks
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