APA (7th ed.) Citation

Lehoczky, S., & Rusczyk, R. (2006). The art of problem solving (7th ed.). AoPS.

Chicago Style (17th ed.) Citation

Lehoczky, Sandor, and Richard Rusczyk. The Art of Problem Solving. 7th ed. Alpine, CA: AoPS, 2006.

MLA (9th ed.) Citation

Lehoczky, Sandor, and Richard Rusczyk. The Art of Problem Solving. 7th ed. AoPS, 2006.