Dyfyniad APA

Sigelman, C. K., & Rider, E. A. (2003). Life-span human development (4th ed.). Thomson/Wadsworth.

Dyfyniad Arddull Chicago

Sigelman, Carol K., and Elizabeth A. Rider. Life-span Human Development. 4th ed. Australia: Thomson/Wadsworth, 2003.

Dyfyniad MLA

Sigelman, Carol K., and Elizabeth A. Rider. Life-span Human Development. 4th ed. Thomson/Wadsworth, 2003.

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