Winkler, D. W., S. M. Billerman, and I.J. Lovette (2020). Tits, Chickadees, and Titmice (Paridae), version 1.0. In Birds of the World (S. M. Billerman, B. K. Keeney, P. G. Rodewald, and T. S. Schulenberg, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.parida1.01
Gosler, A., Clement, P. & Bonan, A. (2018). Tits and Chickadees (Paridae). 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 from https://www.hbw.com/node/52340 on 27 December 2017).