Friedman, Lawrence M., 1930-, author
Tatanusa, 2001
Buku Teks
Beckman, Gail McKnight, author
McGraw-Hill, 1975
Buku Teks
Posner, Richard A., author
The University of Chicago, 1976
Buku Teks
Schuck, Peter H., author
Oxford University Press, 1994
Buku Teks
Findley, Roger W., author
West Publishing, 1996
Buku Teks