Geographical distribution of Pygmy nuthatch.
Kingery, H. E. and C. K. Ghalambor (2001). Pygmy Nuthatch (Sitta pygmaea), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi-org.acces.bibl.ulaval.ca/10.2173/bna.567
Cephas