Cochran, W. (1963). Sampling techniques/2nd ed (2nd ed.). john Wiley.
Chicago Style aipamenaCochran, William. Sampling Techniques/2nd Ed. 2nd ed. London: john Wiley, 1963.
MLA aipamenaCochran, William. Sampling Techniques/2nd Ed. 2nd ed. john Wiley, 1963.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.