APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (1979). An introduction to the theory of numbers (5th edition.). Clarendon Press.

Chicago Style (17th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 5th edition. Oxford: Clarendon Press, 1979.

MLA (8th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 5th edition. Clarendon Press, 1979.