APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (1968). An introduction to the theory of numbers (4th ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 4th ed. Oxford: Clarendon Press, 1968.

MLA (9th ed.) Citation

Hardy, G. H., and E. M. Wright. An Introduction to the Theory of Numbers. 4th ed. Clarendon Press, 1968.