Malinowski, Edmund R.
John Wiley & Sons, 1980
Buku Teks SO
Harman, Harry H.
The University of Chicago Press, 1976
Buku Teks SO
Thompson, Bruce
APA, 2004
Buku Teks SO
Naibaho, Antoni Bona Foncus
Universitas Indonesia, 2016
UI - Tesis Membership
Levine, Mark S.
Sage, 1977
Buku Teks SO