(2014). Real numbers practice. [electronic resource]. 4.
Chicago-čujuhus (17. p.)Real Numbers Practice. [electronic Resource]. 4. 2014.
MLA-čujuhus (9. p.)Real Numbers Practice. [electronic Resource]. 4. 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.