KOIVULA, K.; ORELL, M.; RYTKÖNEN, S. Mate guarding in forest-living, territorial Willow Tits. Ornis Fennica, [S. l.], v. 68, n. 3, p. 105–113, 1991. Disponível em: https://ornisfennica.journal.fi/article/view/133322. Acesso em: 18 touko. 2024.