The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
Hiebert, Murray, author
The encyclopedia of leadership
Mc Graw-Hill , 2001
 Buku Teks
Feather, Leonard, author
The Encyclopedia of jazz
Horizon Press, 1960
 Buku Referensi
The Linguistics encyclopedia
edited by Kirsten Malmkjær, James M. Anderson
Routledge, 1991
 Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
 Buku Referensi
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