Encyclopedia of bioethics : volume 4
Warren Thomas Reich, editor in chief
Simon & Schuster Macmillan, 1995
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Encyclopedia of sociology; Volume 4
Edgar F. Borgatta, editor-in-chief, Marie L. Borgatta, managing editor
Macmillan, 1992
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The New Encyclopedia Britannica : volume 4
Encyclopedia Britannica, 1983
 Buku Referensi
The New Encyclopedia Britannica : volume 4
Encyclopedia Britannica, 1983
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Macmillan encyclopedia of the environment: volume 4
Kellert, Stephen R., general editor; Black Matthew, associate editors; Haley Richard, associate editors
Simon & Schuster, 1997
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