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
The Columbia encyclopedia; Volume V
editor, William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
 Buku Referensi