Robinson, David
John Wiley, 1976
Buku Teks
Olson, William Clinton
Prentice Hall International, 1994
Buku Teks
Viotti, Paul R
Longman, 2012
Buku Teks
Pinar Bilgin, L.H.M. Ling, editor
Routledge, Taylor & Francis Group, 2017
Buku Teks
Couloumbis, Theodore A.
Prentice-Hall, 1990
Buku Teks