Clout, hugh D
Pergamon Press, 1977
Buku Teks SO
edited by Michael Pacione
Routledge, 2014
Buku Teks
Woods, Michael, author
Sage Publications, 2012
eBooks
Chitambar, J.B., author
Wiley Eastern Limited, 1973
Buku Teks
edited by Michael Pacione.
Barnes & Noble Books, [1983;1983;1983;1983;1983, 1983]
Buku Teks