Roberge, Jean-Michel, and Johan Månsson. “Blue Tits Parus Caeruleus Breeding in House Martin Delichon Urbica Nest”. Ornis Svecica 13, no. 2–3 (July 1, 2003): 97–98. Accessed March 28, 2024. https://journals.lub.lu.se/os/article/view/22814.