Cita APA (7th ed.)

ebrary, Inc, Leigh, R. B., & Liu, C. A. (2011). Hungarian problem book IV. Mathematical Association of America.

Cita Chicago (17th ed.)

ebrary, Inc, Robert Barrington Leigh, i Chiang-Fung Andrew Liu. Hungarian Problem Book IV. [Washington, D.C.]: Mathematical Association of America, 2011.

Cita MLA (9th ed.)

ebrary, Inc, et al. Hungarian Problem Book IV. Mathematical Association of America, 2011.