Ahmad Fuad Afdhal, author
Grasindo, 2004
Buku Teks
Cutlip, Scott M., author
Kencana, 2011
Buku Teks
Marston, John E., author
McGraw-Hill, 1979
Buku Teks
edited by Philip Lesly
Prentice-Hall, 1955
Buku Teks
Kitchen, Philip J., author
Internasional Thomson Business Press, 1997
Buku Teks