APA-referens (7:e uppl.)

Williams, B. (1978). A sampler on sampling. John Wiley and Sons.

Chicago-referens (17:e uppl.)

Williams, Bill. A Sampler on Sampling. Nueva York: John Wiley and Sons, 1978.

MLA-referens (9:e uppl.)

Williams, Bill. A Sampler on Sampling. John Wiley and Sons, 1978.