APA (7th ed.) Citation

Morris, R. B., & Irwin, G. W. (1970). Harper encyclopedia of the modern world: A concise reference history from 1760 to the present ([First edition].). Harper & Row.

Chicago Style (17th ed.) Citation

Morris, Richard B., and Graham W. Irwin. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present. [First edition]. New York: Harper & Row, 1970.

MLA (9th ed.) Citation

Morris, Richard B., and Graham W. Irwin. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present. [First edition]. Harper & Row, 1970.