Adler, Freda, author
Houghton Mifflin, 1979
Buku Teks
Mannheim, Hermann, author
Routledge & Kegan Paul, 1970
Buku Teks
Hood, Roger G., author
McGraw-Hill, 1971
Buku Teks
Wilkins, Leslie T.
Barnes & Noble, 1984
Buku Teks
Vito, Gennaro F., author
Wadsworth, 1994
Buku Teks