edited by Daniel Frei
Sage, 1982
Buku Teks
Kapucu, Naim, author
Jones & Bartlett Learning, 2013
Buku Teks
Barton, Dominic, author
John Wiley & Sons, 2003
Buku Teks
USA Cambridge University Press, 2015
Buku Teks
Fisher, Roger, author
Oxford University Press, 1978
Buku Teks