edited by Hersh Zeifman and Cynthia Zimmerman
Macmillan, 1993
Buku Teks
Nicoll, Allardyce, author
George G. Harrap, 1949
Buku Teks
edited by Peter Holloway
Currency Press, 1987
Buku Teks
Coldewey, John C., author
Prentice-Hall, 2001
Buku Referensi
Wessels, Charlyn, author
Oxford University Press, 1991
Buku Teks