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Buku Teks
edited by Anthony J. Kane
Westview Press, 1990
Buku Teks
edited by Richard C. Bush
Westview Press, 1986
Buku Teks
edited by John S. Major
Westview Press, 1986
Buku Teks
Sinaga, Elfrida
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 1995
UI - Skripsi Membership