Abboushi, W.F., 1931-
Political systems of the middle east in the 20th century
Dodd, Mead, 1971
 Buku Teks SO
R. Achmad Sunjayadi
The Early tourist guidebooks to The Dutch East Indies and Malaya in the nineteenth and twentieth century
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2019
 Artikel Jurnal
Woodham, Jonatham M.
Twentieth-Century design
Oxford University Press, 1997
 Buku Teks SO
Chant, Christopher
Twentieth century war machines
London: Chancellor Press, 1999,
 Buku Referensi
Revolutions of the late twentieth century
edited by Jack A. Goldstone, Ted Robert Gurr, Farrokh Moshiri
Westview Press, 1991
 Buku Teks SO