Dyfyniad APA

Texas Water Utilities Journal. Texas Water Utilities Association.

Dyfyniad Arddull Chicago

Texas Water Utilities Journal. Texas Water Utilities Association.

Dyfyniad MLA

Texas Water Utilities Journal. Texas Water Utilities Association.

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