The Columbia encyclopedia; Volume IV
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
Hastings, James
Encyclopedia of religion and ethics; Volume IV
T&T Clark, 1980
 Buku Referensi
Encyclopedia of world cultures; Volume IV
edited by Linda A. Bennett
G.K. Hall, 1992
 Buku Referensi
Encyclopedia of world cultures: volume IV
editor, Linda A. Bennett
New York G.K. Hall [and] Company 1991-1996
 Buku Referensi
Encyclopedia of chemical reactions; Volume IV
edited by C.A. Jacobson
Van Nostrand Reinhold, 1959
 Buku Referensi