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
The Columbia encyclopedia; Volume I
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
The Columbia encyclopedia; Volume V
editor, William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 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
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