Bodnar, George H., author
Prentice Hall International, 1995
Buku Teks
Sweeney, Robert B., author
Prentice-Hall, 1971
Buku Teks
Martin, Mearle, author
Prentice-Hall, 2003
Buku Teks
Desiriana Dinardianti, author
Universitas Indonesia, 2002
UI - Tesis (Membership)
Gelinas, Ulric J., author
South-Western , 2005
Buku Teks