Dyfyniad APA
Santrock, J. W. (2009). Life- span development (12th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Santrock, John W. Life- Span Development. 12th ed. Boston: McGraw-Hill, 2009.
Dyfyniad MLA
Santrock, John W. Life- Span Development. 12th ed. McGraw-Hill, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.