Williamson, John
New York University Press, 1991
Buku Teks
Williamson, John
Harvester Wheatsheaf, 1991
Buku Teks
Adams, John, 1938-
St. Martin's Press, 1985
Buku Teks
Rosser, J. Barkley
McGraw-Hill, 1996
Buku Teks
by George Zis ... [et al.]
Longman, 1988
Buku Teks