Hasselquist, Dennis, Staffan Bensch, and Ulf Ottosson. “Diurnal Song Pattern in the Great Reed Warbler Acrocephalus Arundinaceus”. Ornis Svecica 3, no. 3–4 (October 1, 1993): 125–136. Accessed May 22, 2022. https://journals.lub.lu.se/os/article/view/23037.