What has the author Michael E Schiefelbein written?

Michael Schenk has written:

'Rassismus gegen Sinti und Roma' -- subject(s): Romanies, Ethnic relations, Nazi persecution, Racism, World War, 1939-1945

'Publikums- und Wirkungsforschung' -- subject(s): Communication, Mass media, Social aspects, Social aspects of Communication, Social aspects of Mass media