Basil Gomez and John Paul Jones III, edited
Wiley-Blackwell, 2010
Buku Teks
Johnson, James H., author
Pergamon Press, 1972
Buku Teks
Larson, Richard C., 1943-, author
Prentice-Hall, 1981
Buku Teks
Andranovich, Gregory D., author
Sage, 1993
Buku Teks
rdited by Jack P. Gibbs
D. Van Nostrand, 1967
Buku Teks