[publisher not identified], [date of publication not identified]
Naskah
Linder, Jane C.
American Management Association, 2008
eBooks
Bradberry, John, 1961-
American Management Association, 2011
eBooks
Solomon, R.J.
Hale & Iremonger, 1988
Buku Teks SO
edited by Mohammad Ali Jazayery, Edgar C. Polome, Werner Winter
The Peter De Ridder Press, 1976
Buku Teks SO