APA (7th ed.) Citation

Clarke, J. I. (1972). Population geography ([2nd ed.].). Pergamon Press.

Chicago Style (17th ed.) Citation

Clarke, John Innes. Population Geography. [2nd ed.]. Oxford: Pergamon Press, 1972.

MLA (9th ed.) Citation

Clarke, John Innes. Population Geography. [2nd ed.]. Pergamon Press, 1972.