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landesmuseum.at
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Sachtleben, H. (1919). "Sitta europaea cisalpina subsp. n."Anzeiger der Ornithologischen Gesellschaft in Bayern (in German). 1: 7–8. Archived from the original on 2016-03-05. Retrieved 2018-02-20.
Tschusi zu Schmidhoffen, Viktor von; Zarudny, Nikolai (1905). "Über palaearktische Formen. (IX.)"(PDF). Ornithologisches Jahrbuch (in German). 16: 140. Archived(PDF) from the original on 2014-05-28. Retrieved 2014-05-26.
Robert, Swinhoe (1871). "Mr. R. Swinhoe on the birds of China". Proceedings of the Zoological Society of London. 1871 (2): 350. Archived from the original on 2023-08-31. Retrieved 2018-01-13.
Bonaparte, Charles Lucien (1850). Conspectus generum avium (in Latin). Vol. 1. Lugduni Batavorum [Leyden]: E. J. Brill. p. 227. Archived from the original on 2020-06-05. Retrieved 2018-01-13.
Ogilvie-Grant, William Robert (1909). "Sitta bedfordi, sp. n."Bulletin of the British Ornithologists' Club. 23: 59. Archived from the original on 2022-10-05. Retrieved 2018-01-13.