HÜFKEN, Volker. Telephone Surveys in Europe: Research and Practice. Sabine Häder, Michael Häder, Mike Kühne (Eds.), 2012. methods, data, analyses, [S. l.], v. 7, n. 1, p. 132–138, 2013. DOI: 10.12758/mda.2013.007. Disponível em: https://majournals.bib.uni-mannheim.de/mda/article/view/2013.007. Acesso em: 8 oct. 2025.