Dyfyniad APA
Papalia, D. E., Olds, S. W., & Feldman, R. D. (1998). Human development (7th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Papalia, Diane E., Sally Wendkos Olds, and Ruth Duskin Feldman. Human Development. 7th ed. Boston, Mass.: McGraw-Hill, 1998.
Dyfyniad MLA
Papalia, Diane E., et al. Human Development. 7th ed. McGraw-Hill, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.