APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Hardy, G. H., and Edward Maitland Wright. An Introduction to the Theory of Numbers. 5th ed., reprint. Oxford: Clarendon Press, 2003.

MLA (9th ed.) Citation

Hardy, G. H., and Edward Maitland Wright. An Introduction to the Theory of Numbers. 5th ed., reprint. Clarendon Press, 2003.