Harrison, J. B., & Sullivan, R. E. (1990). A short history of Western civilization (7th.ed.). McGraw-Hill.

Harrison, John B., and Richard Eugene Sullivan. A Short History of Western Civilization. 7th.ed. New York: McGraw-Hill, 1990.

Harrison, John B., and Richard Eugene Sullivan. A Short History of Western Civilization. 7th.ed. McGraw-Hill, 1990.