1. Biometrika, Vol. 32, Part 2. October, 1941. χ2 tables, pages 187–191.
2. Biometrika, Vol. 37, Parts 3 and 4. December 18, 1950. χ2 tables, pages 313–325.
3. Deming, W. Edwards: Statistical Adjustment of Data. John Wiley and Sons. New York 1943.
4. Gilbert, J. Y.: The Errors of the Sedgwick-Rafter Counting Chamber in the Enumeration of Phytoplankton. Transactions of the American Microscopical Society, Vol. LXI, No. 3, July 1942.
5. Hoel, Paul G.: Introduction to Mathematical Statistics. John Wiley and Sons. New York 1947.