The World book encyclopedia : volume 6, F
Field Enterprises Educational Corporation, 1963
 Buku Referensi
Collier's encyclopedia, with bibliography and index : volume 6
P.F. Collier & Son, 1954
 Buku Referensi
Weideman, Hugh
The rapid fact finder : a desk book of universal knowledge / compiled by Hugh Weideman
Thomas Y. Crowell Company, 1958
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
 Buku Referensi
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