ANDERSSON, R. Plumage variation of Rock Pipit Anthus petrosus littoralis and Water Pipit Anthus spinoletta in winter plumage. Ornis Svecica, Lund, Sweden, v. 22, n. 1–2, p. 33–38, 2012. DOI: 10.34080/os.v22.22594. Disponível em: https://journals.lub.lu.se/os/article/view/22594. Acesso em: 1 oct. 2022.