Meehan, Eugene J.
McGraw-Hill, 1966
Buku Teks
Corson, John J., author
McGraw-Hill , 1963
Buku Teks
Beck, J. Murray
University of Toronto Press, 1957
Buku Teks
W. Funston, Bernard
Carswell, 1994
Buku Teks
Stedman, Stephen John
Lynne Rienner Publishers, 1991
Buku Teks