Gupta, S. (2002). Statistical methods. S.Chand & Sons.
Chicago Style aipamenaGupta, S.P. Statistical Methods. New Delhi: S.Chand & Sons, 2002.
MLA aipamenaGupta, S.P. Statistical Methods. S.Chand & Sons, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.