Dyfyniad APA

American Society of Civil Engineers. (1991). Journal of professional issues in engineering education and practice. American Society of Civil Engineers.

Dyfyniad Arddull Chicago

American Society of Civil Engineers. Journal of Professional Issues in Engineering Education and Practice. New York, NY: American Society of Civil Engineers, 1991.

Dyfyniad MLA

American Society of Civil Engineers. Journal of Professional Issues in Engineering Education and Practice. American Society of Civil Engineers, 1991.

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