Shannon, Margaret T.
Prentice-Hall, 2001
Buku Referensi
Harris, Muriel, author
Prentice-Hall, 1997
Buku Referensi
Wilson, Billie Ann, author
Prentice-Hall, 2003
Buku Referensi
Benyamin Molan, author
Prenhallindo, 2002
Buku Referensi
Goldman, Stephen H., author
Houghton Miffiln, 1986
Buku Teks