APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (1992). An introduction to the theory of numbers (5th ed.). Clarendon.

Chicago Style (17th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 5th ed. Oxford: Clarendon, 1992.

MLA (9th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 5th ed. Clarendon, 1992.