APA (7th ed.) Citation

Cole, G. D. H. (1937). Practical economics, or, Studies in economic planning. Penguin Books.

Chicago Style (17th ed.) Citation

Cole, G. D. H. Practical Economics, or, Studies in Economic Planning. London: Penguin Books, 1937.

MLA (8th ed.) Citation

Cole, G. D. H. Practical Economics, or, Studies in Economic Planning. Penguin Books, 1937.