@book{Hedwig2006,
  author    = {Johann Hedwig},
  title     = {Joannis Hedwigii Fundamentum historiae naturalis muscorum frondosorum concernens eorum flores, fructus, seminalem propagationnem adiecta methodica iconibus illustratis},
  url       = {http://caliban.mpiz-koeln.mpg.de/~stueber/hedwig/historiae/index.html},
  year      = {2006},
}