Gupta, S. C. (1988). Business Statistics. Himalaya.
Chicago Style (17th ed.) ZitazioaGupta, S. C. Business Statistics. Mumbai: Himalaya, 1988.
MLA (9th ed.) ZitazioaGupta, S. C. Business Statistics. Himalaya, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.