Fisher, Ronald A. (1922). "On the Interpretation of χ2 from Contingency Tables, and the Calculation of P". Journal of the Royal Statistical Society. 85 (1): 87–94. doi:10.2307/2340521. JSTOR2340521.
Yates, Frank (1934). "Contingency table involving small numbers and the χ2 test". Supplement to the Journal of the Royal Statistical Society. 1 (2): 217–235. doi:10.2307/2983604. JSTOR2983604.
Fisher, Ronald A. (1922). "On the Interpretation of χ2 from Contingency Tables, and the Calculation of P". Journal of the Royal Statistical Society. 85 (1): 87–94. doi:10.2307/2340521. JSTOR2340521.
Fisher, Ronald A. (1924). "The Conditions Under Which χ2 Measures the Discrepancey Between Observation and Hypothesis". Journal of the Royal Statistical Society. 87 (3): 442–450. JSTOR2341149.
Yates, Frank (1934). "Contingency table involving small numbers and the χ2 test". Supplement to the Journal of the Royal Statistical Society. 1 (2): 217–235. doi:10.2307/2983604. JSTOR2983604.