Corry, J. A.
University of Toronto Press, 1960
Buku Teks
OConnor, Karen, author
Addison Wesley Longman, 2001
Buku Teks
by William J. Keefe ... [and others]
The Dorsey Press, 1983
Buku Teks
Judd, Dennis R., author
Little, Brown, 1979
Buku Teks
Lancaster, Lane W.
Van Nostrand , 1952
Buku Teks