Traccey, William R.
Amacom , 1974
Buku Teks
Pearlson, Keri E.
Koleksi Publik
Pearlson, Keri E., author
John Wiley & Sons, 2004
Buku Teks
edited by Martin Reynolds; Sue Holwell
Springer, 2010
Buku Teks
West, Brian G., author
Oxford Road, 1986
Buku Teks