Sarnoff, D. (1968). Looking ahead. New York: McGraw- Hill Book Company.
Dyfyniad Arddull ChicagoSarnoff, David. Looking Ahead. New York: McGraw- Hill Book Company, 1968.
Dyfyniad MLASarnoff, David. Looking Ahead. New York: McGraw- Hill Book Company, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.