एपीए उद्धरण

Zhang, Y. (2011). Combinatorial problems in mathematical competitions. East china normal university.

शिकागो स्टाइल उद्धरण

Zhang, Yao. Combinatorial Problems in Mathematical Competitions. Shanghai: East china normal university, 2011.

एमएलए उद्धरण

Zhang, Yao. Combinatorial Problems in Mathematical Competitions. East china normal university, 2011.