Dyfyniad APA

(1985). Strength evaluation of existing concrete bridges. American Concrete Institute.

Dyfyniad Arddull Chicago

Strength Evaluation of Existing Concrete Bridges. Detroit: American Concrete Institute, 1985.

Dyfyniad MLA

Strength Evaluation of Existing Concrete Bridges. American Concrete Institute, 1985.

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