Ingram, Robert W.
South-Western Publishing, 2004
Buku Teks
Knapp, Michael C.
Ohio South-Western, 1998
Buku Teks
Harrington, Diana R., 1940-
The Dryden Press, 1985
Buku Teks
Hampton, John J., 1942-
Prentice-Hall, 1989
Buku Teks
edited by Michael Doumpos, Constantin Zopounidis, Panos M. Pardalos
Springer, 2012
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