Williams, C. A., & .Heins, R. M. (1981). Risk management and insurance (4th ed.). McGraw-Hill.
Chicago Style (17th ed.) ZitazioaWilliams, C. Arthur, eta Richard M. .Heins. Risk Management and Insurance. 4th ed. New York: McGraw-Hill, 1981.
MLA (9th ed.) ZitazioaWilliams, C. Arthur, eta Richard M. .Heins. Risk Management and Insurance. 4th ed. McGraw-Hill, 1981.