Sondell, Jan. “Moult Strategies of White Wagtail Motacilla Alba and Yellow Wagtail Motacilla Flava in Central Sweden”. Ornis Svecica 3, no. 3–4 (October 1, 1993): 107–116. Accessed April 25, 2024. https://journals.lub.lu.se/os/article/view/23035.