Temes, Roberta
American Management Association, 2009
eBooks
edited by Andrew Blake
Routledge, 1999
Buku Teks
Carroll, Stephen J.
Dorling Kindersley , 1992
Buku Referensi
Hendriks, Jean Harris
Routledge , 1993
Buku Teks
Beyfus, Drusilla
Reed International Books, [date of publication not identified]
Buku Teks