[1]
Andersson, R. 2012. Plumage variation of Rock Pipit Anthus petrosus littoralis and Water Pipit Anthus spinoletta in winter plumage. Ornis Svecica. 22, 1–2 (Jan. 2012), 33–38. DOI:https://doi.org/10.34080/os.v22.22594.