<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Drost, Ellen. </hi> 2011. <anchor xmlns="http://www.tei-c.org/ns/1.0" xml:id="id_page437R_mcid0" /> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">„</hi>Validity and Reliability in Social Science Research.“ <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Education Research and Perspectives</hi> 38 (1), 105–124.