International encyclopedia of the social sciences : volume 5 & 6
edited by David L. Sills
Macmillan and The Free Press, 1968
 Buku Referensi
The Encyclopedia of philosophy: volumes 5 and 6
editor in chief Paul Edward
MacMilan, 1972
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International military and defense encyclopedia; Volume 6
editor-in-chief, Trevor N. Dupuy
Brassey's, 1993
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 6
Americana Corporation, 1960
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The Encyclopedia Americana : the international reference work, volume 5
Americana Corporation, 1960
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