The Encyclopedia Americana : volume 2
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 1
Americana Corporation, 1977
 Buku Referensi
The Columbia encyclopedia; Volume II
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
The Columbia encyclopedia; Volume III
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
The Columbia encyclopedia; Volume IV
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
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