Bojarinova, Julia, Olga Babushkina, Valery Shokhrin, och Olga Valchuk. ”Autumn Migration of the Long-Tailed Tit (Aegithalos C. Caudatus) at the Opposite Sides of the Eurasian Continent”. Ornis Fennica 93, no. 4 (december 31, 2016): 235–245. åtkomstdatum maj 18, 2024. https://ornisfennica.journal.fi/article/view/133904.