Rozman, Gilbert, author
Princeton University Press, 1973
Buku Teks
Kolars, John F., author
McGraw-Hill, 1974
Buku Teks
Hallenbeck, Wilbur C., author
Harper & Brothers , 1951
Buku Teks
Kresl, Peter Karl., author
Northampton, MA : Edward Elgar, 2005
Buku Teks
Andranovich, Gregory D., author
Sage, 1993
Buku Teks