1. Considerations of the place of assumptions in correlational analysis;Binder;Am. Psychol.,1959
2. A method for the direct measurement of erosion on rock surfaces;High;Br. Geomorphol. Res. Group Tech. Bull.,1970
3. Rank Correlation Methods;Kendall,1962
4. Non-normality and product moment correlation;Norris;J. Exp. Educ.,1961
5. Non-parametric statistics for the Behavioral Sciences;Siegel,1956