Susskind, Lawrence
The Free Press, 1996
Buku Teks
White, Lawrence J.
Oxford University Press, 1991
Buku Teks
Lipsky, Michael
Russel Sage Foundation, 1980
Buku Teks
Corbett, Michael,
Longman, 1982.
Buku Teks
Milburn, Michael A.
California Brooks/Cole Pub. , 1991
Buku Teks