Dyfyniad APA

ASJ. (2012). ACI Structural Journal January-February 2012. American Concrete Institute.

Dyfyniad Arddull Chicago

ASJ. ACI Structural Journal January-February 2012. American Concrete Institute, 2012.

Dyfyniad MLA

ASJ. ACI Structural Journal January-February 2012. American Concrete Institute, 2012.

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