The World book encyclopedia : volume 7
World Book, 1985
 Buku Referensi
The encyclopedia of philosophy; volume 7 and 8
editor in chief, Paul Edwards
Macmilan , 1972
 Buku Referensi
Encyclopedia of inorganic chemistry; Volume 7
editor-in-chief, R. Bruce King
John Wiley & Sons, 1995
 Buku Referensi
Kodansha encyclopedia of Japan : volume 7
Kodansha, 1983
 Buku Referensi
Encyclopedia of human intelligence : volume 2
editor in chief. Robert J. Sternberg
Macmillan, 1994
 Buku Referensi
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