Walker, Richard
De Agostini, 1996
Buku Teks SO
Sudjic, Deyan
Mitchell Beazley, 1986
Buku Referensi
Paulson, Edward
Prenada Media, 2003
Buku Teks SO
Solovic, Susan Wilson, 1958-
American Management Association, 2012
eBooks
Solovic, Susan Wilson, 1958-
Amacom, 2012
Buku Teks SO