SCHÖLIN, K. G.; KÄLLANDER, H. A Blue Tit Cyanistes caeruleus population: its recent increase and breeding data. Ornis Svecica, Lund, Sweden, v. 22, n. 1–2, p. 19–24, 2012. DOI: 10.34080/os.v21.22597. Disponível em: https://journals.lub.lu.se/os/article/view/22597. Acesso em: 22 may. 2022.