Paper  bibtex   

@article{ stevens_territory_2002,
  title = {Territory distribution and foraging patterns of cirl buntings ({Emberiza} cirlus) breeding in the {UK}},
  volume = {107},
  url = {http://www.sciencedirect.com/science/article/pii/S0006320702000691},
  number = {3},
  urldate = {2015-02-23TZ},
  journal = {Biological Conservation},
  author = {Stevens, Danaë K. and Donald, Paul F. and Evans, Andy D. and Buckingham, David L. and Evans, Julianne},
  year = {2002},
  pages = {307--313}
}