Dunham, Arthur, author
Thomas Y Crowell, 1962
Buku Teks
edited by Mayer N. Zald
Quadrangle Books, 1967
Buku Teks
edited by Ralph M. Kramer, Harry Specht
Prentice-Hall, 1983
Buku Teks
Ross, Murray G., author
Harper & Row, 1955
Buku Teks
Columbia University Press , 1960
Buku Teks