Vito, Gennaro F., author
Wadsworth, 1994
Buku Teks
Gennifer Furst, editor
SAGE , 2009
Buku Teks
Mannheim, Hermann, author
Routledge & Kegan Paul, 1973
Buku Teks
Adler, Freda
McGraw-Hill, 2007
Multimedia
Adler, Freda, author
McGraw-Hill , 2007
Multimedia