Zhang, Y. (2011). Combinatorial problems in mathematical competitions. World Scientific.
Čikaški stil citiranjaZhang, Yao. Combinatorial Problems in Mathematical Competitions. Singapore: World Scientific, 2011.
MLA način citiranjaZhang, Yao. Combinatorial Problems in Mathematical Competitions. World Scientific, 2011.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.