Grinbergs,A. R. (1963) Nekotorye dannye o faune peroedov ptic semejstv Accipitridae v Latvii
Skutch, A. F. (1947) The Castlebuilder
GBIF Backbone Taxonomy. doi:10.15468/39omei
Accessed via http://www.gbif.org/species/2877 on 2016-08-27
This backbone name usage is included because it was found in another checklist at the time the backbone was built. The primary source name usage (121102018) has since been removed from the portal.
This record was last modified on Jul 25, 2016.