edited by Michael Parker
Routledge , 1999
Buku Teks
Edge, Raymond S.
Cengage Learning, 2018
Buku Teks
Seedhouse, David
Sage Publications, 2019
eBooks
Garrett, Thomas M.
Prentice-Hall, 2001
Buku Teks
Devettere, Raymond J.
Georgetown University Press, 1995
Buku Teks