Sekuler, R., & Blake, R. (1990). Perception (Second edition.). McGraw-Hill Publishing Company.
Dyfyniad Arddull ChicagoSekuler, Robert, and Randolph Blake. Perception. Second edition. New York: McGraw-Hill Publishing Company, 1990.
Dyfyniad MLASekuler, Robert, and Randolph Blake. Perception. Second edition. McGraw-Hill Publishing Company, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.