Dale, Svein. “Population Size and Trend, and Habitat Selection of Common Moorhens (Gallinula Chloropus) in Oslo and Akershus, Southeastern Norway”. Ornis Norvegica 44 (March 17, 2021): 1-11. Accessed October 28, 2021. https://boap.uib.no/index.php/ornis/article/view/3163.