Miller, George
Prentice-Hall, 1986
Buku Teks
Garofalo, Gene, author
Prentice-Hall, 1994
Buku Referensi
Martin, Samuel E.
Rutland Charles E. Tuttle Company 1992
Buku Referensi
Corwin, Charles H., author
Prentice-Hall, 2001
Buku Teks
Benyamin Molan, author
Prenhallindo, 2002
Buku Referensi