@article{Bos2017Takkeling,
   title     = {De Sperwer Accipiter nisus als broedvogel in de provincie Groningen in 2016},
   author    = {Bos, Johan},
   journal   = {De Takkeling},
   volume    = {25},
   number    = {1},
   pages     = {73--78},
   year      = {2017}
}