BirdLife International (2004). Buteo buteo. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. ᎠᏓᏁᎳᏅᎯ ᎠᏴᏍᏗ ᎠᏠᏯᏍᏗ ᎦᎴᏴᏗᏍᎬᎢ ᎾᏍᎩᎾᎢ ᎦᏙᏃ ᎪᎯ ᎢᏧᎳᎭ ᏗᏂᏱᎴᎩ ᎨᏒᎢ ᎠᏂᎦᏲᎵ ᎤᏃᏝᎩ