Dyfyniad APA

(1975). Basic Concrete Construction Practice Portland Cement Association. John Wiley & Sons, Inc.

Dyfyniad Arddull Chicago

Basic Concrete Construction Practice Portland Cement Association. John Wiley & Sons, Inc, 1975.

Dyfyniad MLA

Basic Concrete Construction Practice Portland Cement Association. John Wiley & Sons, Inc, 1975.

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