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eBooks
White, Ron
Ziff-Davis Press, 1993
Buku Teks SO
Gultom, Edwin Bart
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2003
UI - Tesis Membership
Gorsline, G.W.
Prentice-Hall, 1980
Buku Teks SO
Lewis, T.G. [Theodore Gyle]
Reston Publishing, 1982
Buku Teks SO