Levy, John M., author
Prentice-Hall, 1991
Buku Referensi
1970
Buku Teks
edited by Alice O'Connor, Chris Tilly and Lawrence D. Bobo
Russel Sage Foundations, 2001
Buku Teks
The John Hopkins University Press, 1980
Buku Teks
Solomon, Arthur P., author
MIT Press, 1974
Buku Teks