Katona, George
McGraw-Hill Book , 1960
Buku Teks
Katona, George
McGraw-Hill , 1964
Buku Teks
Paris, Bernard J., author
Indiana University Press, 1974
Buku Teks
Sherman, Andrew J., author
Amacom, 2011
Buku Teks
Naisbitt, John, author
Brealey, 1994
Buku Teks