Corwin, Charles H., author
Prentice-Hall, 2001
Buku Teks
by Billie Ann Wilson ... [and others]
Prentice-Hall, 2007
Buku Teks
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