Cochran, W. (1963). Sampling techniques (2nd.). John Wiley.
Chicago-čujuhus (17. p.)Cochran, W. Sampling Techniques. 2nd. New York: John Wiley, 1963.
MLA-čujuhus (9. p.)Cochran, W. Sampling Techniques. 2nd. John Wiley, 1963.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.