Spiegel, M. R., & Stephens, L. J. (1999). Schaum's outline of theory and problems of statistics (3rd ed.). McGraw-Hill; Tata McGraw-Hill.

Spiegel, Murray R., and Larry J. Stephens. Schaum's Outline of Theory and Problems of Statistics. 3rd ed. New York ; New Delhi: McGraw-Hill; Tata McGraw-Hill, 1999.

Spiegel, Murray R., and Larry J. Stephens. Schaum's Outline of Theory and Problems of Statistics. 3rd ed. McGraw-Hill; Tata McGraw-Hill, 1999.