Geographical distribution of White-winged crossbill.   Year-round  Nonbreeding
BirdLife International. 2017. Loxia leucoptera (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22728944A111144194. https://dx.doi.org/10.2305/IUCN.UK.2017-1.RLTS.T22728944A111144194.en. Downloaded on 16 July 2018.
Cephas