Hansen, M. H., Hurwitz, W. N., & Madow, W. G. (1993). Sample survey methods and theory. John Wiley & Sons.
Cita Chicago (17th ed.)Hansen, Morris H., William N. Hurwitz, i William G. Madow. Sample Survey Methods and Theory. Nueva York: John Wiley & Sons, 1993.
Cita MLA (9th ed.)Hansen, Morris H., et al. Sample Survey Methods and Theory. John Wiley & Sons, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.