Ryttman, Hans, and K Susanna S Hall-Karlsson. “Brood Size of Four Titmice (Paridae) During 1962–2001”. Ornis Svecica 20, no. 2 (April 1, 2010): 57–62. Accessed November 24, 2024. https://journals.lub.lu.se/os/article/view/22639.