Wallis, W. A., & Roberts, H. V. (1956). Statistics a new approach. The Free.
Chicago-čujuhus (17. p.)Wallis, W. Allen, juo Harry V. Roberts. Statistics a New Approach. Nueva York: The Free, 1956.
MLA-čujuhus (9. p.)Wallis, W. Allen, juo Harry V. Roberts. Statistics a New Approach. The Free, 1956.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.