Gorman, Paul
Kogan Page, 1998
Buku Teks
Peter, J. Paul, author
McGraw-Hill, 2004
Buku Teks
Algie, Jimmy
Kogan Page, 1975
Buku Referensi
edited by Albert Newgardsen
American Management Association, 1958
Buku Teks
Johnston, Mark W., author
McGraw-Hill, Irwin, 2003
Buku Teks