APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (2003). An introduction to the theory of numbers (5. ed., repr.). Clarendon Press.

Chicago Style (17th ed.) Citation

Hardy, Godfrey H., and Edward M. Wright. An Introduction to the Theory of Numbers. 5. ed., repr. Oxford: Clarendon Press, 2003.

MLA (9th ed.) Citation

Hardy, Godfrey H., and Edward M. Wright. An Introduction to the Theory of Numbers. 5. ed., repr. Clarendon Press, 2003.