Gupta, S. P., & Gupta, M. P. (2016). Business statistics (18th ed.). Sultan Chand & Sons.
Lua i Stíl Chicago (17ú heag.)Gupta, S. P., agus M. P. Gupta. Business Statistics. 18th ed. New Delhi: Sultan Chand & Sons, 2016.
Lua MLA (9ú heag.)Gupta, S. P., agus M. P. Gupta. Business Statistics. 18th ed. Sultan Chand & Sons, 2016.
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