Cita APA (7th ed.)

Zhang, Y. (2011). Combinatorial problems in mathematical competitions. World Scientific.

Cita Chicago (17th ed.)

Zhang, Yao. Combinatorial Problems in Mathematical Competitions. Singapore: World Scientific, 2011.

Cita MLA (9th ed.)

Zhang, Yao. Combinatorial Problems in Mathematical Competitions. World Scientific, 2011.