APA (7th ed.) Citation

Hardy, G. H., & Wright, E. M. (2004). An introduction to the theory of numbers (Fifth edition.). Oxford University Press.

Chicago Style (17th ed.) Citation

Hardy, G. H., and Edward Maitland Wright. An Introduction to the Theory of Numbers. Fifth edition. Oxford ; New York: Oxford University Press, 2004.

MLA (8th ed.) Citation

Hardy, G. H., and Edward Maitland Wright. An Introduction to the Theory of Numbers. Fifth edition. Oxford University Press, 2004.