Dyfyniad APA

Berk, L. E. (2004). Development through the lifespan. Boston: Allyn & Bacon.

Dyfyniad Arddull Chicago

Berk, Laura E. Development Through the Lifespan. Boston: Allyn & Bacon, 2004.

Dyfyniad MLA

Berk, Laura E. Development Through the Lifespan. Boston: Allyn & Bacon, 2004.

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