Hardy, G. H., Wright, E. M., Heath-Brown, D. R., & Silverman, J. H. (2008). Introduction to the theory of numbers.- 6th ed. (6th ed.). Oxford University Press.

Hardy, G. H., Edward Maitland Wright, D. R. Heath-Brown, e Joseph H. Silverman. Introduction to the Theory of Numbers.- 6th Ed. 6th ed. Oxford ; New York: Oxford University Press, 2008.

Hardy, G. H., et al. Introduction to the Theory of Numbers.- 6th Ed. 6th ed. Oxford University Press, 2008.