Dyfyniad APA

WILLIAMS, C., & HEINS, R. M. (1989). Risk management and insurance.-- ed.6. McGraw-Hill.

Dyfyniad Arddull Chicago

WILLIAMS, C.Arthur, and Richard M. HEINS. Risk Management and Insurance.-- Ed.6. New York: McGraw-Hill, 1989.

Dyfyniad MLA

WILLIAMS, C.Arthur, and Richard M. HEINS. Risk Management and Insurance.-- Ed.6. McGraw-Hill, 1989.

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