@article{Bos2016TakkelingB,
   title     = {De Sperwer Accipiter nisus als broedvogel in de provincie Groningen in 2015},
   author    = {Bos, Johan},
   journal   = {De Takkeling},
   volume    = {24},
   number    = {2},
   pages     = {133--138},
   year      = {2016}
}