ebrary, Inc, Leigh, R. B., & Liu, C. A. (2011). Hungarian problem book IV. Mathematical Association of America.
Čikaški stil citiranja (17. izdanje)ebrary, Inc, Robert Barrington Leigh, i Chiang-Fung Andrew Liu. Hungarian Problem Book IV. [Washington, D.C.]: Mathematical Association of America, 2011.
MLA način citiranja (9. izdanje)ebrary, Inc, et al. Hungarian Problem Book IV. Mathematical Association of America, 2011.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.