Rodgers, Beth L., author
Lippincott Williams & Wilkins , 2005
Buku Teks
Ziman, John, author
Cambridge University Press, 1996
Buku Teks SO
Gerald Bernbom
ossey - Bass, 2001
Buku Teks
Mingers, John, author
Springer, 2006
Buku Teks
Starbuck, William H., author
Oxford Univesity Press, 2006
Buku Teks