Wolff, Robert Lee
The Balkans in our time / by Robert Lee Wolff
Harvard University Press, 1956
 Buku Teks SO
Reed, Bill
Crooks / Bill Reed
Hyland House, 1984
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Crooks, J.E.
The Spectrum in chemistry / J.E. Crooks
Academic Press, 1978
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Human sexuality
edited by Susan J. Bunting
McGraw-Hill, 2003
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Kelly, Gery F.
Sexuality today
McGraw-Hill, Higher Education, 2008
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