APA (7th ed.) Citation

Clarke, J. I. (1971). Population geography and the developing countries. Pergamon Press.

Chicago Style (17th ed.) Citation

Clarke, John Innes. Population Geography and the Developing Countries. Oxford: Pergamon Press, 1971.

MLA (9th ed.) Citation

Clarke, John Innes. Population Geography and the Developing Countries. Pergamon Press, 1971.