Please use the following references whenever using data retrieved with tr8():

BIOLFLOR - Eine Datenbank zu biologisch-ökologischen Merkmalen zur Flora von Deutschland. Schriftenreihe für Vegetationskunde 38: 1-333. (Bundesamt für. Bonn, Bundesamt für Naturschutz)

Kleyer, M., Bekker, R.M., Knevel, I.C., Bakker, J.P, Thompson, K., Sonnenschein, M., Poschlod, P., Van Groenendael, J.M., Klimes, L., Klimesova, J., Klotz, S., Rusch, G.M., Hermy, M., Adriaens, D., Boedeltje, G., Bossuyt, B., Dannemann, A., Endels, P., Götzenberger, L., Hodgson, J.G., Jackel, A-K., Kühn, I., Kunzmann, D., Ozinga, W.A., Römermann, C., Stadler, M., Schlegelmilch, J., Steendam, H.J., Tackenberg, O., Wilmann, B., Cornelissen, J.H.C., Eriksson, O., Garnier, E., Peco, B. (2008): The LEDA Traitbase: A database of life-history traits of Northwest European flora. Journal of Ecology 96: 1266-1274.

Fitter, A . H. and Peat , H. J., 1994, The Ecological Flora Database, J. Ecol., 82, 415-425.

Pignatti S., Menegoni P., Pietrosanti S., 2005, Biondicazione attraverso le piante vascolari. Valori di indicazione secondo Ellenberg (Zeigerwerte) per le specie della Flora d'Italia. Braun-Blanquetia 39, Camerino, pp. 97.

Asem A. Akhmetzhanova, Nadejda A. Soudzilovskaia, Vladimir G. Onipchenko, Will K. Cornwell, Vladimir A. Agafonov, Ivan A. Selivanov, and Johannes H. C. Cornelissen. 2012. A rediscovered treasure: mycorrhizal intensity database for 3000 vascular plants species across the former Soviet Union. Ecology 93:689.

As tr8 is continually evolving, you may want to cite its version number. Find it with 'help(package=tr8)'.

Corresponding BibTeX entries:

  @Article{,
    author = {Klotz Stefan and Kühn Ingolf and Durka Walter},
    title = {BIOLFLOR - Eine Datenbank zu biologisch-ökologischen
      Merkmalen zur Flora von Deutschland. 38: 1-333.  (Bundesamt für.
      Bonn, Bundesamt für Naturschutz)},
    journal = {Schriftenreihe für Vegetationskunde},
    year = {2002},
    volume = {38},
    pages = {1-333},
    url = {http://dx.doi.org/10.1111/j.1366-9516.2004.00106.x},
  }
  @Article{,
    author = {{Kleyer} and {M.} and {Bekker} and {R.M.} and {Knevel}
      and {I.C.} and {Bakker} and {J.P} and {Thompson} and {K.} and
      {Sonnenschein} and {M.} and {Poschlod} and {P.} and Van
      Groenendael and {J.M.} and {Klimes} and {L.} and {Klimesova} and
      {J.} and {Klotz} and {S.} and {Rusch} and {G.M.} and {Hermy} and
      {M.} and {Adriaens} and {D.} and {Boedeltje} and {G.} and
      {Bossuyt} and {B.} and {Dannemann} and {A.} and {Endels} and {P.}
      and {Götzenberger} and {L.} and {Hodgson} and {J.G.} and {Jackel}
      and {A-K.} and {Kühn} and {I.} and {Kunzmann} and {D.} and
      {Ozinga} and {W.A.} and {Römermann} and {C.} and {Stadler} and
      {M.} and {Schlegelmilch} and {J.} and {Steendam} and {H.J.} and
      {Tackenberg} and {O.} and {Wilmann} and {B.} and {Cornelissen}
      and {J.H.C.} and {Eriksson} and {O.} and {Garnier} and {E.} and
      {Peco} and {B.}},
    title = {The LEDA Traitbase: A database of life-history traits of
      Northwest European flora.},
    journal = { Journal of Ecology},
    year = {2008},
    volume = {96},
    pages = {1266-1274},
  }
  @Article{,
    author = {{Fitter} and A . H. and {Peat} and H. J.},
    title = {The Ecological Flora Database},
    year = {1994},
    journal = { Journal of Ecology},
    volume = {82},
    pages = {415-425},
  }
  @Article{,
    author = {Pignatti S. and Menegoni P. and Pietrosanti S.},
    title = {Biondicazione attraverso le piante vascolari. Valori di
      indicazione secondo Ellenberg (Zeigerwerte) per le specie della
      Flora d'Italia.},
    journal = {Braun-Blanquetia},
    pages = {97},
    year = {2005},
  }
  @Article{,
    year = {2012},
    journal = {Ecology},
    volume = {93},
    pages = {689},
    title = {A rediscovered treasure: mycorrhizal intensity database
      for 3000 vascular plants species across the former Soviet Union},
    author = {Asem A. Akhmetzhanova and Nadejda A. Soudzilovskaia and
      Vladimir G. Onipchenko and Will K. Cornwell and Vladimir A.
      Agafonov and Ivan A. Selivanov and Johannes H. C. Cornelissen},
  }