Black, K. (2004). Business Statistics (4th.). John Wiley & Sons.
Chicago-čujuhus (17. p.)Black, Ken. Business Statistics. 4th. John Wiley & Sons, 2004.
MLA-čujuhus (9. p.)Black, Ken. Business Statistics. 4th. John Wiley & Sons, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.