Fenstermacher, Karen
Saunders, 1997
Buku Teks SO
edited by Axalla J. Hoole [and others]
J.B. Lippincott, 1995
Buku Teks SO
W.B. Saunders , 1989
Buku Teks SO
Zaumeyer, Carolyn
Davis company, 2003
Buku Teks SO
edited by Mike Walsh, Alison Crumbie, Shirley Reveley
Butterworth-Heinemann, 1999
Buku Teks SO