Gupta, S. (2008). Business Statistics 15e (15 th.). Sultan Chand.
Cita Chicago (17th ed.)Gupta, S.P. Business Statistics 15e. 15 th. New Delhi: Sultan Chand, 2008.
Cita MLA (9th ed.)Gupta, S.P. Business Statistics 15e. 15 th. Sultan Chand, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.