@book{HeimannLangnerMuelleretal.2007,
  author    = {Heinz-Dieter Heimann and Martin M. Langner and Mario M{\"u}ller and Birgit Zacke},
  title     = {Weltbilder des mittelalterlichen Menschen},
  volume    = {12},
  isbn      = {978-3-89693-476-5},
  year      = {2007},
}