Gupta, S. P., & Gupta, M. P. (2005). Business statistics (14th ed.). Sultan Chand & Sons.
Chicago-čujuhus (17. p.)Gupta, S. P., juo M. P. Gupta. Business Statistics. 14th ed. New Delhi: Sultan Chand & Sons, 2005.
MLA-čujuhus (9. p.)Gupta, S. P., juo M. P. Gupta. Business Statistics. 14th ed. Sultan Chand & Sons, 2005.
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