Schiller, Bradley R., author
Prentice-Hall, 1989
Buku Teks
Schiller, Bradley R., author
Irwin Mc Graw-Hill , 1997
Buku Teks
Burschell
Buku Teks
Commons, John R.
The University of Wisconsin Press, 1961
Buku Teks
Ehrlich, Paul R., author
Islan Press, 2004
Buku Teks