Tracy, Brian, author
American Management Association, 2004
eBooks
editor A. Dale Timpe
Elex Media Komputindo, 1991
Buku Teks
Mancini, Marc, author
McGraw-Hill, 2003
Buku Teks
Bittel, Lester Robert, author
McGraw-Hill, 1991
Buku Teks
Yager, R. Yan, author
Hannacroic Creek Book, 1999
Buku Teks
Spillane, James J., author
Kanisius, 2003
Buku Teks