Leicester University Press, 1997
Buku Teks
Conn, Steven, author
University of Pennsylvania Press, 2003
Buku Teks
Ambrose, James E., author
[publisher not identified], [date of publication not identified]
Buku Teks
Simha, D.Ajitha
Tata McGraw-Hill, 1985
Buku Teks
Glass, Robert L., author
Prentice-Hall, 1992
Buku Teks