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Prentice-Hall, 1989
Buku Teks
Engel, James F., author
Binarupa Aksara, 1994
Buku Teks
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2016
UI - Makalah dan Kertas Kerja
by Roger Blackwell ... [et al.]
Cengage Learning Asia, 2006
Buku Teks
The University of North Carolina Press, 1974
Buku Teks