Robinson, David
Gramedia Pustaka Utama, 1996
Buku Teks
Brennan, Lynne
Platkus, 1991
Buku Teks
Grant-Sokolosky, Valerie
Dabara Bengawan, 1991
Buku Teks
Langford, Beverly Y.
American Management Association, 2005
eBooks
Beyfus, Drusilla
Reed International Books, [date of publication not identified]
Buku Teks