Hardy, G. H., Wright, E. M., Heath-Brown, D. R., & Silverman, J. H. (2008). An introduction to the theory of numbers (Sixth edition.). Oxford University Press.

Hardy, G. H., E. M. Wright, D. R. Heath-Brown, and Joseph H. Silverman. An Introduction to the Theory of Numbers. Sixth edition. Oxford ; New York: Oxford University Press, 2008.

Hardy, G. H., et al. An Introduction to the Theory of Numbers. Sixth edition. Oxford University Press, 2008.