Dyfyniad APA

Portland Cement Association, C. (1964). Handbook of concrete culvert pipe hydraulics. Chicago: Portland Cement Association.

Dyfyniad Arddull Chicago

Portland Cement Association, Chicago. Handbook of Concrete Culvert Pipe Hydraulics. Chicago: Portland Cement Association, 1964.

Dyfyniad MLA

Portland Cement Association, Chicago. Handbook of Concrete Culvert Pipe Hydraulics. Chicago: Portland Cement Association, 1964.

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