References

Daly, F., D. J. Hand, M. C. Jones, A. D. Lunn and K. J. McConway, (1995), Elements of Statistics, Addison Wesley.

Bhattacharyya, G. K. and R. A. Johnson, (1977), Statistical Concepts and Methods, John Wiley & Sons, Inc.

Johnson, R. A. and G. K. Bhattacharyya, (1996), STATISTICS: Principles and Methods, Third Edition, John Wiley & Sons, Inc.