Encyclopedia of human intelligence : volume 2
editor in chief. Robert J. Sternberg
Macmillan, 1994
 Buku Referensi
The Encyclopedia Americana : the international reference work, volume 7
Americana Corporation, 1960
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International encyclopedia of the social sciences : volume 7 & 8
edited by David L. Sills
Macmillan and The Free Press, 1968
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The World book encyclopedia : volume 7, G
Field Enterprises Educational Corporation, 1963
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Collier's encyclopedia, with bibliography and index : volume 7
P.F. Collier & Son, 1954
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