Yule, G. Udny (1897). "On the Theory of Correlation". Journal of the Royal Statistical Society (Blackwell Publishing) 60 (4): 812–54. JSTOR2979746. doi:10.2307/2979746.
Fisher, R.A. (1922). "The goodness of fit of regression formulae, and the distribution of regression coefficients". Journal of the Royal Statistical Society (Blackwell Publishing) 85 (4): 597–612. JSTOR2341124. doi:10.2307/2341124.
Yule, G. Udny (1897). "On the Theory of Correlation". Journal of the Royal Statistical Society (Blackwell Publishing) 60 (4): 812–54. JSTOR2979746. doi:10.2307/2979746.
Fisher, R.A. (1922). "The goodness of fit of regression formulae, and the distribution of regression coefficients". Journal of the Royal Statistical Society (Blackwell Publishing) 85 (4): 597–612. JSTOR2341124. doi:10.2307/2341124.