APA (7th ed.) Citation

Clarke, J. I. (1972). Population geography / by John I. Clarke (2nd ed.). Pergamon.

Chicago Style (17th ed.) Citation

Clarke, John I. Population Geography / by John I. Clarke. 2nd ed. Oxford: Pergamon, 1972.

MLA (9th ed.) Citation

Clarke, John I. Population Geography / by John I. Clarke. 2nd ed. Pergamon, 1972.

Warning: These citations may not always be 100% accurate.