Castel, Helene
Macmillan, 1971
Buku Teks
Rhonda Phillips, Robert H. Pittman, editor
Routledge, 2009
Buku Teks
Webster, Andrew, author
Macmillan, 1990
Buku Teks
Keenan, Thomas, author
Sage Publications, 2004
Buku Teks
Norton, George W., author
McGraw-Hill, 1993
Buku Teks