Abboushi, W.F., 1931-
Political systems of the middle east in the 20th century
Dodd, Mead, 1971
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R. Achmad Sunjayadi
The Early tourist guidebooks to The Dutch East Indies and Malaya in the nineteenth and twentieth century
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2019
 Artikel Jurnal
Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
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Varga, Eugen, 1879-1964
Twentieth century capitalism
Foreign Languages Publishing House, 1961
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Kohn, Hans
African nationalism in the twentieth century
D. Van Nostrand, 1965
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