Sussman, Lyle
South Western Publishing, 1984
Buku Teks
Littlejohn, Stephen W, author
Thomson, 2005
Buku Teks
Tubbs, Stewart L., author
McGraw-Hill, 2008
Buku Teks
Pandjaitan, Ivan Sahat Hartawan, author
Universitas Indonesia, 2006
UI - Tesis (Membership)
Tubbs, Stewart L., author
Remaja Rosdakarya, 1996
Buku Teks