Aldrich, John H. and McGraw, Kathleen M.. Improving Public Opinion Surveys, Princeton: Princeton University Press, 2011. https://doi.org/10.1515/9781400840298
Aldrich, John H. and McGraw, Kathleen M.. Improving Public Opinion Surveys. Princeton: Princeton University Press, 2011. https://doi.org/10.1515/9781400840298