Gillham, Bill, author
Continuum , 2000
Buku Teks
Newlen, Robert R., author
Neal-Schuman Publishers, 2006
Buku Teks
Ross, Catherine Sheldrick, author
Neal - Schuman Publishers, Inc., 2002
Buku Teks
editors, Jaber F. Gubrium, James A. Holstein
Sage, 2002
Buku Referensi
Stewart, Charles J., author
McGraw-Hill, 2000
Buku Teks