Cochran, W. G. (2009). Sampling Techniques (3rd edn.). Wiley Eastern.
Cita Chicago (17th ed.)Cochran, William G. Sampling Techniques. 3rd edn. New Dehli: Wiley Eastern, 2009.
Cita MLA (9th ed.)Cochran, William G. Sampling Techniques. 3rd edn. Wiley Eastern, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.