Cochran, W. C. (1963). Sampling techniques (2d ed.). Wiley.
Cita Chicago (17th ed.)Cochran, William Campbell. Sampling Techniques. 2d ed. New York: Wiley, 1963.
Cita MLA (9th ed.)Cochran, William Campbell. Sampling Techniques. 2d ed. Wiley, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.