Dyfyniad APA

Sigelman, C. K., & Rider, E. A. (2009). Life-span human development (6th ed.). Wadsworth Cengage Learning.

Dyfyniad Arddull Chicago

Sigelman, Carol K., and Elizabeth A. Rider. Life-span Human Development. 6th ed. Belmont, Calif: Wadsworth Cengage Learning, 2009.

Dyfyniad MLA

Sigelman, Carol K., and Elizabeth A. Rider. Life-span Human Development. 6th ed. Wadsworth Cengage Learning, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.