1. Davidson, K.R., Dosig, A.P.: Real Analysis and Applications. Theory in Practice. Springer, New York (2010)
2. Erdős, P., Surányi, J.: Topics in the Theory of Numbers. Springer, New York (2003)
3. Euclid: The Thirteen Books of the Elements [Translated with introduction and commentary by Sir Thomas Heath]. Second Edition Unabridged. Dover, New York (1956)
4. Hewitt, E., Stromberg, K.: Real and Abstract Analysis. Springer, New York (1975)
5. Niven, I., Zuckerman, H.S., Montgomery, H.L.: An Introduction to the Theory of Numbers, 5th edn. Wiley, New York (1991)