@misc{aapor
,	title	= {Standard Definitions: Final Dispositions of Case Codes and Outcome Rates for Surveys.}
,	author	= "{The American Association for Public Opinion Research}"
, edition = {9th edition}
,	year	= {2016}
, publisher = {AAPOR}
, url = {https://www.aapor.org/Standards-Ethics/Standard-Definitions-(1).aspx}
, urldate = {27.04.2018}
}

@book{vdk,
  title={Practical Tools for Designing and Weighting Survey Samples},
  author={Valliant, R. and Dever, J.A. and Kreuter, F.},
  series={Statistics for Social and Behavioral Sciences},
  year={2013},
  publisher={Springer New York}
}
