The encyclopedia of libertarianism
editor, Ronald Hamowy
Sage Publications, 2008
 Buku Referensi
Sloane, Thomas O., author
Encyclopedia of rhetoric
Oxford University Press, 2001
 Buku Referensi
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
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