The encyclopedia of democracy : volume I
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
The Columbia encyclopedia; Volume I
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
World press encyclopedia; Volume I
edited by George Thomas Kurian
Facts on File, 1982
 Buku Referensi
The harper encyclopedia of science: volume I, A through D
editor, James R. Newman
Harper & Row, 1963
 Buku Referensi
The World book encyclopedia : volume 9, I
Field Enterprises Educational Corporation, 1963
 Buku Referensi
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