APA (7th ed.) Citation

Erdős, P., & Sárkőzy, A. Some solved and unsolved problems in combinatorial number theory.

Chicago Style (17th ed.) Citation

Erdős, Pál, and András Sárkőzy. Some Solved and Unsolved Problems in Combinatorial Number Theory.

MLA (9th ed.) Citation

Erdős, Pál, and András Sárkőzy. Some Solved and Unsolved Problems in Combinatorial Number Theory.

Warning: These citations may not always be 100% accurate.