The encyclopedia of democracy; Volume II
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
The encyclopedia of democracy : volume III
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
The encyclopedia of democracy : volume IV
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
The encyclopedia of democracy : volume I
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
The Columbia encyclopedia; Volume II
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
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