Doniol-Valcroze, Paul. “On the Taxonomic Status of the Siberian Chiffchaff Phylloscopus [collybita] tristis (Phylloscopidae)”. Zootaxa 5432, no. 1 (March 27, 2024): 145–150. Accessed April 29, 2025. https://mapress.com/zt/article/view/zootaxa.5432.1.12.