edited by Harriet H. Werley, Joyce J. Fitzpatrick, Roma Lee Taunton
Springer, 1986
Buku Teks
Toynbee, Arnold J.
Oxford University Press, 1956
Buku Teks
edited by Rusell B. Goodman
Routledge, 2005
Buku Teks
Ferguson, John Alexander
National Library of Australia, 1977
Buku Referensi
editor in chief, Seymour Martin Lipset
Routledge, 1995
Buku Referensi