O`Brien, Jamie, author
Routledge, 2019
Buku Teks
edited by David Popenoe
Rutgers University Press, 1969
Buku Teks
Kunstler, James Howard, author
The Free Press, 2001
Buku Teks
Karp, David A., author
Praeger, 2015
Buku Teks
Gallion, Arthur B., author
D. Van Nostrand, 1975
Buku Teks