Cavanaugh, J. C., & Blanchard-Fields, F. (2011). Adult development and aging (6th ed.). Wadsworth/Cengage Learning.
Dyfyniad Arddull ChicagoCavanaugh, John C., and Fredda Blanchard-Fields. Adult Development and Aging. 6th ed. Australia: Wadsworth/Cengage Learning, 2011.
Dyfyniad MLACavanaugh, John C., and Fredda Blanchard-Fields. Adult Development and Aging. 6th ed. Wadsworth/Cengage Learning, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.