References
- Conover, W. J. (1971). Practical Nonparametric Statistics. John Wiley & Sons, New York.
- Hollander, M. and Wolfe, D. (1973). Nonparametric Statistical Methods. John Wiley & Sons, New York.
- Stigler, S. M. (1999). Statistics on the Table: The History of Statistical Concepts and Methods. Harvard, Cambridge, MA.