McDaniel, Carl
South Western Cengage Learning, 2013
Buku Teks SO
Armstrong, Gary M.
Prentice-Hall, 2005
Buku Teks SO
Farbey, A.D.
Crest Publishing House, 2001
Buku Teks SO
Ryan, William T.
Richard D. Irwin, 1981
Buku Teks
Davis, Judy
Crest, 2001
Buku Teks