Geographical distribution of Lapland Longspur Calcarius lapponicus.   Breeding  Migration  Nonbreeding
BirdLife International. 2017. Calcarius lapponicus (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22721033A111138693. https://dx.doi.org/10.2305/IUCN.UK.2017-1.RLTS.T22721033A111138693.en. Downloaded on 10 May 2018.
Cephas