Libes, Sol
Osborne/McGraw-Hil, 1981
Buku Teks
Valvano, Jonathan W., 1953-
Cengage Learning, 2012
Buku Teks
Alexander, Roy, 1925-
American Management Association;, 2009
eBooks
Evans, G. R. (Gillian Rosemary)
Open University Press, 2002
Buku Teks
Kvern, Martin Olav
Macromedia Press, 1998
Buku Teks