@article{734759,
      author = {Nelson, Randy Joe. and Denlinger, David L. and Somers,  David E.,},
      url = {http://library.usi.edu/record/734759},
      title = {Photoperiodism the biological calendar / [electronic  resource] :},
      publisher = {Oxford University Press,},
      recid = {734759},
      pages = {xiii, 581 p. :},
      address = {Oxford ;},
      year = {2009},
}