Dyfyniad APA

Covington, G. A., & Hannah, B. Access by design.

Dyfyniad Arddull Chicago

Covington, George A., and Bruce Hannah. Access by Design.

Dyfyniad MLA

Covington, George A., and Bruce Hannah. Access by Design.

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