Glazer, Myron, author
Random House, 1972
Buku Teks
Johnson, John M., author
The Free Press, 1975
Buku Teks
Cohen, Nathan Edward, author
National Ass. of Workker, 1964
Buku Teks
edited by J.M. Gvishiani
Pergamon Press, 1984
Buku Teks
Junker, Buford H., author
University of Chicago Press, 1960
Buku Teks