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John Wiley & Sons, 1980
Buku Teks
Harman, Harry H.
The University of Chicago Press, 1976
Buku Teks
Thompson, Bruce
APA, 2004
Buku Teks
Naibaho, Antoni Bona Foncus
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UI - Tesis Membership
Levine, Mark S.
Sage, 1977
Buku Teks