edited by Lee Harrison
McGraw-Hill, 1997
Buku Referensi
Keefe, William J., author
Prentice-Hall, 1994
Buku Teks
Edited, Bernadette West, Peter M. Sandman, Michael R. Greenberg; Penerjemah, Soediro
Yayasan Obor Indonesia, 1998
Buku Teks
Craig, Robin Kundis
Thomson/West, 2008
Buku Teks
Rose, Jerome G.
The State University of New Jersey, 1974
Buku Teks