1. J. E. Freund, Mathematical Statistics, (Prentice Hall Inc., 1992)
2. Hogg and Craig, Introduction to Mathematical Statistics, (Collier Macmillan, 1958)
3. Mood, Greyill and Boes, Introduction to the Theory of Statistics, (McGraw Hill)
4. R. E. Walpole, Introduction to Statistics, (Macmillan Publishing Company, 1982)
5. M. R. Spiegel and L. J. Stephens, Statistics, (McGraw Hill Book Company, 1984)