edited by Griffith Edwards ... [et at.]
Saxon House, 1976
Buku Teks SO
Jarvis, Tracey J.
John Wiley & Sons, 1995
Buku Teks SO
Anderson, Philip O., editor
McGraw-Hill, 2002
Buku Referensi
edited by Kent R. Olson
Aplleton & Lange, 1996
Buku Teks SO
Shannon, Michael W.
Saunders , 2007
Buku Teks SO