Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
Buku Teks
Askari, Hossein, author
John Wiley & Sons, 2009
Buku Teks
edited by Colin Harris
Taylor Graham , 1994
Buku Teks
edited by Paul Boreham, Geoffrey Stokes and Richard Hall
Pearson-Longman, 2004
Buku Teks
edited by Amitav Acharya and Richard Stubbs
UBC Press, 1995
Buku Teks