APA (7th ed.) Citation

Moore, G. E. (1988). Principia ethica. Prometheus Books.

Chicago Style (17th ed.) Citation

Moore, G. E. Principia Ethica. Amherst, N.Y: Prometheus Books, 1988.

MLA (9th ed.) Citation

Moore, G. E. Principia Ethica. Prometheus Books, 1988.