Bean, L. H. (1969). The art of forecasting. Random House.
Cita Chicago (17th ed.)Bean, Louis Hyman. The Art of Forecasting. New York: Random House, 1969.
Cita MLA (9th ed.)Bean, Louis Hyman. The Art of Forecasting. Random House, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.