@incollection{Heckmann1990,
  author    = {Friedrich Heckmann},
  title     = {Der Kampf um den Sonntag},
  isbn      = {3-89376-009-1},
  doi       = {10.25968/opus-41},
  url       = {http://nbn-resolving.de/urn:nbn:de:bsz:960-opus-881},
  year      = {1990},
  language  = {de}
}