APA (7th ed.) Citation

Eddington, S. A. (1936). Relativity theory of protons and electrons. The Macmillan.

Chicago Style (17th ed.) Citation

Eddington, Sir Arthur. Relativity Theory of Protons and Electrons. New York: The Macmillan, 1936.

MLA (9th ed.) Citation

Eddington, Sir Arthur. Relativity Theory of Protons and Electrons. The Macmillan, 1936.

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