APA (7th ed.) Citation

Hardy, G. H., Littlewood, J. E., & Polya, G. (1999). Inequalities. Cambridge University Press.

Chicago Style (17th ed.) Citation

Hardy, G. H., John E. Littlewood, and George Polya. Inequalities. Cambridge: Cambridge University Press, 1999.

MLA (9th ed.) Citation

Hardy, G. H., et al. Inequalities. Cambridge University Press, 1999.