edited by Mary Feeney
Taylor Graham, 1986
Buku Referensi
Earl, Michael J., author
Prentice-Hall, 1989
Buku Teks
Bawden, David, author
Butterworth, 1990
Buku Teks
edited by Ralph H. Sprague and Barbara C. McNurlin
Prentice-Hall International, 1993
Buku Teks
Thomsett, Rob, author
Prentice-Hall, 1993
Buku Teks