Darley, J. M., Glucksberg, s., & Kinchla, R. A. (1991). Psychology (5th ed.). Prentice-Hall.
Dyfyniad Arddull ChicagoDarley, John M., sam Glucksberg, and Ronald A. Kinchla. Psychology. 5th ed. Englewood cliffs: Prentice-Hall, 1991.
Dyfyniad MLADarley, John M., et al. Psychology. 5th ed. Prentice-Hall, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.