Enger, Eldon D.
McGraw-Hill Higher Education, 2004
Buku Referensi
Mayer, J. Richard
McGraw-HIll, 2001
Buku Teks
Arms, Karen
Saunders College Publishing, 1990
Buku Teks
Cunningham, William P.
WCB/McGraw-Hill, 1999
Buku Referensi
Masters, Gilbert M.
Prentice-Hall, 2008
Buku Teks