Dobbs. CIE: STATISTICS 2 : ADVANCED LEVEL MATHEMATICS. Cambridge.
Chicago-čujuhus (17. p.)Dobbs. CIE: STATISTICS 2 : ADVANCED LEVEL MATHEMATICS. Cambridge.
MLA-čujuhus (9. p.)Dobbs. CIE: STATISTICS 2 : ADVANCED LEVEL MATHEMATICS. Cambridge.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.