Dyfyniad APA

Berk, L. E. (1999). Infants, children, and adolescents (3rd ed.). Allyn and Bacon.

Dyfyniad Arddull Chicago

Berk, Laura E. Infants, Children, and Adolescents. 3rd ed. Boston: Allyn and Bacon, 1999.

Dyfyniad MLA

Berk, Laura E. Infants, Children, and Adolescents. 3rd ed. Allyn and Bacon, 1999.

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