LINDSTRÖM, Åke; BENSCH, S.; HEDENSTRÖM, A. An exceptionally large Willow Warbler Phylloscopus trochilus. Ornis Svecica, Lund, Sweden, v. 22, n. 3–4, p. 139–141, 2012. DOI: 10.34080/os.v22.22590. Disponível em: https://journals.lub.lu.se/os/article/view/22590. Acesso em: 16 may. 2022.