HAFTORN, Svein. Et par av gråsisik Carduelis flammeamed dobbeltkull i Finnmark. Ornis Svecica, Lund, Sweden, v. 12, n. 3, p. 165, 2002. DOI: 10.34080/os.v12.22830. Disponível em: https://journals.lub.lu.se/os/article/view/22830. Acesso em: 17 aug. 2024.