ebrary, Inc, Leigh, R. B., & Liu, C. A. (2011). Hungarian problem book IV. Mathematical Association of America.
Chicago-čujuhus (17. p.)ebrary, Inc, Robert Barrington Leigh, juo Chiang-Fung Andrew Liu. Hungarian Problem Book IV. [Washington, D.C.]: Mathematical Association of America, 2011.
MLA-čujuhus (9. p.)ebrary, Inc, et al. Hungarian Problem Book IV. Mathematical Association of America, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.