References Periodical
- Greenwood, J. A., and Sandomire, M. M., “Sample Size Required for Estimating the Standard Deviation as a Per Cent of its True Value”, Journal of the American Statistical Association Vol. 45, No. 250, June 1950, pp. 257–260.
Book
- Owen, D. B., “Handbook of Statistical Tables”, Addison-Wesley, Reading, Mass., 1962, pp. 58–59.