Zaumeyer, Carolyn
Davis company, 2003
Buku Teks SO
Chase, Susan K.
F.A. Davis , 2004
Buku Teks SO
edited by Patti Rager Zuzelo
Jones and Bartlett Publishers, 2010
Buku Teks SO
Fenstermacher, Karen
Saunders, 1997
Buku Teks SO
edited by Mike Walsh, Alison Crumbie, Shirley Reveley
Butterworth-Heinemann, 1999
Buku Teks SO