Davis, Ken
Charles E. Merrill Publishing Company, 1983
Buku Teks
Sant, Tom, author
American Management Association, 2012
eBooks
Daniel, Carter A., author
McGraw-Hill, 2012
Buku Teks
Bromage, Mary C., author
McGraw-Hill, 1979
Buku Teks
Weaver, Patricia C., author
Free Press, 1977
Buku Teks