Cohen, Morris R.
The Free Press , 1954
Buku Teks
Cohen, Morris R.
Harcourt, Brace & World, Inc., 1934
Buku Teks
Cohen, Morris L.
West Publishing , 1978
Buku Teks
Morris, Desmond
McGraw-Hill , 1969
Buku Teks
Cohen, Morris Raphael
Free Press, 1950
Buku Teks