Niven, I. M., Zuckerman, H. S., & Montgomery, H. L. (1991). An introduction to the theory of numbers (Fifth edition.). Wiley.

Niven, Ivan Morton, Herbert S. Zuckerman, and Hugh L. Montgomery. An Introduction to the Theory of Numbers. Fifth edition. New York; New Delhi: Wiley, 1991.

Niven, Ivan Morton, et al. An Introduction to the Theory of Numbers. Fifth edition. Wiley, 1991.