Pedraza, P. d. (2010). A Spanish Continuous Volunteer Web Survey: Sample Bias, Weighting and Efficiency. Centro de Investigaciones Sociológicas.
Chicago-Zitierstil (17. Ausg.)Pedraza, Pablo de. A Spanish Continuous Volunteer Web Survey: Sample Bias, Weighting and Efficiency. Centro de Investigaciones Sociológicas, 2010.
MLA-Zitierstil (9. Ausg.)Pedraza, Pablo de. A Spanish Continuous Volunteer Web Survey: Sample Bias, Weighting and Efficiency. Centro de Investigaciones Sociológicas, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.