Horner, Chris, author
Cambridge, 2004
Buku Teks
Halverson, william H
Random House, 1969
Buku Teks
Losee, John, author
Oxford University Press, 1980
Buku Teks
Cornman, James W., author
Macmillan, 1968
Buku Teks
Hospers, John, author
Roudledge, 1988
Buku Teks