Mikkonen, A. V. “Spring Flocking of the Chaffinch Fringilla Coelebs and the Brambling F. Montifringilla in Northern Finland”. Ornis Fennica 61, no. 2 (July 1, 1984): 33–53. Accessed April 19, 2025. https://ornisfennica.journal.fi/article/view/133145.