Williams, C. A., & .Heins, R. M. (1981). Risk management and insurance (4th ed.). McGraw-Hill.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিWilliams, C. Arthur, এবং Richard M. .Heins. Risk Management and Insurance. 4th ed. New York: McGraw-Hill, 1981.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিWilliams, C. Arthur, এবং Richard M. .Heins. Risk Management and Insurance. 4th ed. McGraw-Hill, 1981.