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Buku Teks
editor, Ronald Mackay, Bruce Barkman, R.R. Jordan
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Buku Teks
Sidauruk, Juniato, author
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UI - Tesis (Membership)
Jesness, Jerry, author
Corwin Press, 2004
Buku Teks
Hutchinson, Tom, 1930-
Cambridge University Press , 1993
Buku Teks