Woodbury, Richard B.
Columbia University Press, 1973
Buku Teks SO
Hutton, Peter
APA Publications, 1993
Buku Referensi
December, John
Prenhalindo, 1997
Buku Teks
Harold, Elliotte Rusty
IDG Books Worldwide, 1997
Buku Teks
Farrell, Joyce
Course Technology, 2014
Buku Teks