Haywood, Roger, 1939-, author
McGraw-Hill , 1984
Buku Teks
Cutlip, Scott M., author
Indeks, 2005
Buku Teks
Dilenschneider, Robert L., author
American Management Association, 2010
eBooks
Yosal Iriantara, author
Simbiosa Rekatama Media, 2005
Buku Teks
Zollo, Burt
McGraw-Hill Book, 1967
Buku Teks