@book{Pallas2006,
  author    = {Peter Simon Pallas},
  title     = {Flora rossica seu stirpium imperii rossici per Europam et Asiam indigenarum descriptiones ; Tomi 1, Pars 1-2},
  edition   = {Nachdruck},
  url       = {http://caliban.mpiz-koeln.mpg.de/~stueber/pallas/band1/index.html},
  year      = {2006},
}