APA (7th ed.) Citation

Harrod, R. F. (1943). Britain's future population. Oxford Univ. Pr.

Chicago Style (17th ed.) Citation

Harrod, R. F. Britain's Future Population. London: Oxford Univ. Pr, 1943.

MLA (8th ed.) Citation

Harrod, R. F. Britain's Future Population. Oxford Univ. Pr, 1943.