KUITUNEN, M. Seasonel and geographical variation in the clutch size of the Common Treecreeper Certhia familiaris. Ornis Fennica, [S. l.], v. 64, n. 4, p. 125–136, 1987. Disponível em: https://ornisfennica.journal.fi/article/view/133243. Acesso em: 5 apr. 2025.