Mirsan Abadi, author
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UI - Tesis (Membership)
Leach, Richard H., author
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Buku Teks
Wiarda, Howard J., author
Thomson Wadsworth, 2000
Buku Teks
Curtis, Michael, author
Harper & Row, 1978
Buku Teks
McCormick, John, 1954-, author
Thomson Wadsworth, 2004
Buku Teks