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UI - Skripsi (Membership)
editor, Benny YP Siahaan
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Buku Teks
Greenberg, Stanley, 1956-, author
The Johns Hopkins University Press, 1998
Buku Teks
Rosenfeld, Paul
University of Illinois, 1961
Buku Teks
Rutherfurd, Edward, author
Ballantine Books Trade Paperbacks, 2010
Buku Teks