Williams, B. (1978). A sampler on sampling. John Wiley and Sons.
Chicago-čujuhus (17. p.)Williams, Bill. A Sampler on Sampling. Nueva York: John Wiley and Sons, 1978.
MLA-čujuhus (9. p.)Williams, Bill. A Sampler on Sampling. John Wiley and Sons, 1978.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.