APA (7th ed.) Citation

Sidgwick, N. V. (1927). The electronic theory of valency. Oxford University Press.

Chicago Style (17th ed.) Citation

Sidgwick, Nevil Vincent. The Electronic Theory of Valency. London: Oxford University Press, 1927.

MLA (9th ed.) Citation

Sidgwick, Nevil Vincent. The Electronic Theory of Valency. Oxford University Press, 1927.