Hafstad, Inge, and Geir Rudolfsen. “Yellowhammer Emberiza Citrinella Nesting in Reed Phragmites Australis”. Ornis Norvegica 27 (January 1, 2004): 60-61. Accessed August 11, 2020. https://boap.uib.no/index.php/ornis/article/view/202.