@techreport{HarthPeter1990,
  author    = {Harth-Peter, Waltraud},
  title     = {Montessori in der DDR?},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-42730},
  year      = {1990},
  abstract  = {No abstract available},
  subject      = {Kind},
  language  = {de}
}
@techreport{HarthPeter1989,
  author    = {Harth-Peter, Waltraud},
  title     = {Generalversammlung der Association Montessori Internationale (AMI) vom 1. April 1989},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-42695},
  year      = {1989},
  abstract  = {No abstract available},
  subject      = {Montessori},
  language  = {de}
}
@techreport{HarthPeterFuchs1988,
  author    = {Harth-Peter, Waltraud and Fuchs, Birgitta},
  title     = {A.M.I. International Study Conference: Washington D. C., 31. Juli bis 3. August 1988},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-42792},
  year      = {1988},
  abstract  = {No abstract available},
  language  = {de}
}