APA (7th ed.) Citation

Guy, R. K. (1994). Unsolved Problems in Number Theory (Second Edition.). Springer New York. https://doi.org/10.1007/978-1-4899-3585-4

Chicago Style (17th ed.) Citation

Guy, Richard K. Unsolved Problems in Number Theory. Second Edition. New York, NY: Springer New York, 1994. https://doi.org/10.1007/978-1-4899-3585-4.

MLA (9th ed.) Citation

Guy, Richard K. Unsolved Problems in Number Theory. Second Edition. Springer New York, 1994. https://doi.org/10.1007/978-1-4899-3585-4.