APA

Williams W. H., Williams B., . (1978). A sampler on sampling. New York [u.a.]: Wiley.

Chicago

Williams William Howard, Williams Bill, . 1978. A sampler on sampling. New York [u.a.]: Wiley.

Harvard

Williams W. H., Williams B., . (1978). A sampler on sampling. New York [u.a.]: Wiley.

MLA

Williams William Howard, Williams Bill, . A sampler on sampling. New York [u.a.]: Wiley. 1978.