@article{HarthPeter1989,
  author    = {Harth-Peter, Waltraud},
  title     = {Was ist mit dem "Freien Ausdruck"? / Maria Montessori ({\"U}bersetzung)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-51048},
  year      = {1989},
  abstract  = {No abstract available},
  subject      = {Kind},
  language  = {de}
}
@article{HarthPeter1987,
  author    = {Harth-Peter, Waltraud},
  title     = {{\"U}ber moralische und soziale Erziehung / Maria Montessori ({\"U}bersetzung)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-51069},
  year      = {1987},
  abstract  = {No abstract available},
  subject      = {Erziehung},
  language  = {de}
}