Sheehan, Michael, author
Prentice-Hall, 1991
Buku Referensi
Hibbison, Eric, author
Prentice-Hall, 1984
Buku Referensi
Schiffhorst, Gerald J., author
McGraw-Hill, 1991
Buku Referensi
Kramer, Melinda G., author
Prentice-Hall, 1995
Buku Referensi
Gibaldi, Joseph, author
The Modern Language Association, 2003
Buku Teks