Spiegel M. R., Stephens L. J., . (2000). Schaums Outlines Theory & Problems of Statistics. Delhi: Tata McGraw Hill.
Spiegel M R, Stephens L J, . 2000. Schaums Outlines Theory & Problems of Statistics. Delhi: Tata McGraw Hill.
Spiegel M R, Stephens L J, . Schaums Outlines Theory & Problems of Statistics. Delhi: Tata McGraw Hill. 2000.