edited by Ronald Cohen and Elman R. Service
Institute for the Study of Human Issues, 1978
Buku Teks
Elkins, T. H., author
Macmillan, 1973
Buku Teks
Brugmann, Jeb, 1957-, author
Bloomsbury Press, 2010
Buku Teks
edited by Alice O'Connor, Chris Tilly and Lawrence D. Bobo
Russel Sage Foundations, 2001
Buku Teks
Stevenson, Deborah, author
Open University Press, 2003
Buku Teks