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hbw.com
Winkler, H., Christie, D. A. & Kirwan, G. M. (2019). "Eurasian Wryneck (Jynx torquilla)". In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D. A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. Retrieved 26 November 2019.
Benz, Brett W.; Robbins, Mark B.; Peterson, A. Townsend (2006). "Evolutionary history of woodpeckers and allies (Aves: Picidae): Placing key taxa on the phylogenetic tree". Molecular Phylogenetics and Evolution. 40 (2): 389–399. doi:10.1016/j.ympev.2006.02.021. PMID16635580.