Hongel, H., and L. Saari. “A Mixed Pair of Collared Streptopelia Decaocto and Turtle Doves S. Turtur in Kokkola, W Finland, in 1978–79”. Ornis Fennica 60, no. 2 (July 1, 1983): 61–62. Accessed November 23, 2024. https://ornisfennica.journal.fi/article/view/133126.