@book{WestrichSchwenningerHerrmannetal.2009,
  author    = {Paul Westrich and Hans Richard Schwenninger and Mike Herrmann and Martin Klatt and Matthias Klemm and Rainer Prosi and Arno Schanowski},
  title     = {Rote Liste der Bienen Baden-W{\"u}rttembergs},
  edition   = {3., neu bearb. Fassung, 1. Aufl., Stand 15. Februar 2000)},
  year      = {2009},
}