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D.C.Heath, 1986
Buku Teks
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McGraw-Hill, 1975
Buku Teks
Godin, Seth, author
Bhuana Ilmu Populer, 2002
Buku Teks
Michael Wehandy, author
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UI - Tesis Membership
Peters, Thomas J.
Sang saka gotra, 1985
Buku Teks