Taxon - Odkazy a literatura
Gill F., Donsker D. & Rasmussen P. (eds): IOC World Bird List 3.3 [http://www.worldbirdnames.org/] [jako Pica pica hemileucoptera Stegmann, 1928]Datum citace: 11. duben 2013
Clements, J. F.: eBird/Clements checklist of birds of the world 6.7, Cornell Lab of Ornithology [jako Pica pica hemileucoptera]Datum citace: 7. duben 2013