Peek, Jerry D., author
O`Reilly and Associates, 1992
Buku Teks
Glass, Graham, author
Prentice-Hall, 1999
Buku Teks
Fakultas Teknik Universitas Indonesia, 1993
UI - Skripsi (Membership)
Flynn, Nancy, author
American Management Association, 2009
eBooks
Hertzoff, Ira, author
McGraw-Hill, 1995
Buku Referensi