TRYFOS, P. (1996). Sampling methods for applied research: Text and cases. John Wiley and Sons.
Cita Chicago (17th ed.)TRYFOS, Peter. Sampling Methods for Applied Research: Text and Cases. New York: John Wiley and Sons, 1996.
Cita MLA (9th ed.)TRYFOS, Peter. Sampling Methods for Applied Research: Text and Cases. John Wiley and Sons, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.