Munford, Alan, author
McGraw-Hill, 1980
Buku Teks
Steers, Richard M., author
Kent Publishing, 1985
Buku Teks
Lynch, James J., author
Pan Books, 1972
Buku Teks
Zander, Alvin
Jossey-Bass Publishers, 1994
Buku Teks
Redwood, Stephen, author
John Wiley & Sons, 1999
Buku Teks