Weiss, Carol H., author
Colombia University, 1972
Buku Teks
Suchman, Edward A., author
Russell Sage Foundation, 1967
Buku Teks
DePoy, Elizabeth, author
Brooks/Cole-Thomson Learning, 2003
Buku Teks
Guba, Egon G., author
Jossey-Bass , 1981
Buku Teks
Rossi, Peter H., author
Sage, 1993
Buku Teks