Northouse, Laurel L.
Appleton & Lange , 1998
Buku Teks
Christoper, Tom
Free Press, 1982
Buku Teks
Northouse, Peter G.
Prentice-Hall, 1985
Buku Referensi
Kennamer, Mike
Thomson/Delmar Learning, 2005
Buku Teks
Ketchum, Paul A.
John Wiley & Sons, 1984
Buku Teks