HORTLING, I. En gulfotad gråtrut Larus argentatus omissus Sushkin? häckande i S Finland. Ornis Fennica, [S. l.], v. 7, n. 3, p. 61–67, 1930. Disponível em: https://ornisfennica.journal.fi/article/view/132252. Acesso em: 1 nov. 2024.