Acuff, Frank L., author
American Management Association, 2008
eBooks
Tan, Joo Seng, author
McGraw-Hill, 2004
Buku Teks
Adam Sia, author
Elex Media Komputindo, 2000
Buku Teks
Flenning, Peter
Megapoin, 1996
Buku Teks
Hartman, George M.
Gramedia Pustaka Utama, 1997
Buku Teks