Toynbee, Arnold J., author
A study of history; Volume VIII
Oxford University Press, 1955
 Buku Teks
Toynbee, Arnold J., author
A study of history; Volume IX
Oxford University Press, 1955
 Buku Teks
Toynbee, Arnold J., author
A study of history; Volume VII
Oxford University Press, 1955
 Buku Teks
The Columbia encyclopedia; Volume IV
edited by William Bridgwater dan Seymour Kurtz
Columbia University Press, 1963
 Buku Referensi
The encyclopedia of democracy : volume IV
editor in chief, Seymour Martin Lipset
Routledge, 1995
 Buku Referensi
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