APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (1938). An introduction to the theory of numbers. Clarendon Press.

Chicago Style (17th ed.) Citation

Hardy, Godfrey Harold, and Edward Maitland Wright. An Introduction to the Theory of Numbers. Oxford: Clarendon Press, 1938.

MLA (9th ed.) Citation

Hardy, Godfrey Harold, and Edward Maitland Wright. An Introduction to the Theory of Numbers. Clarendon Press, 1938.