Marling, Sven. 2014. “Density of Chiffchaffs Phylloscopus C. Collybita and Willow Warblers Phylloscopus Trochilus in a South Swedish Villa Suburb”. Ornis Svecica 24 (3–4). Lund, Sweden:99–105. https://doi.org/10.34080/os.v24.22555.