HAKALA, A. V. K.; NYHOLM, E. S. Two nests of the Two- barred Crossbill Loxia leucoptera in Kuusamo in 1971. Ornis Fennica, [S. l.], v. 50, n. 1, p. 46–47, 1973. Disponível em: https://ornisfennica.journal.fi/article/view/132848. Acesso em: 20 apr. 2025.