Oxford University Press, 1998
Buku Teks
Sutherland, Max, author
Allen and Unwin, 2000
Buku Teks
Gosh, Barbara
Lynne Rienner, 1991
Buku Teks
Roman, Kenneth
St. Martin's Press , 1976
Buku Teks
edited by Frederic S. Mishkin
University of Chicago Press, 2001
Buku Teks