edited by Stuart Brown, Diane Collinson, Robert Wilkinson
Roudledge, 1996
Buku Referensi
Keylor, William R., 1944-, author
Oxford University Press, 1996
Buku Teks
Nichols, Jeannette P., author
D. Appleton-Century, 1943
Buku Teks
edited by Alexander Baltzly, A. William Salomone
Appleton-Century-Crofts, 1950
Buku Teks
Cassell, 1993
Buku Referensi