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European Passerines. British Trust for Ornithology, Thetford. ISBN 91-630-1118-2. Robertson, I. S. (1977). Identification and European status of eastern...3 KB (283 words) - 09:25, 24 August 2023
Passerines (4th ed.). Stockholm: L. Svensson. pp. 34, 222–223. ISBN 91-630-1118-2. Davies, N. B.; Brooke, M. de L. (1989). "An experimental study of co-evolution...12 KB (1,254 words) - 08:54, 22 February 2024
ISBN 0-123-84150-X. Svensson, Lars (1992). Identification Guide to European Passerines (4th ed.). Stockholm: L. Svensson. pp. 34, 222–223. ISBN 91-630-1118-2....6 KB (648 words) - 06:33, 5 December 2022
Svensson, L. (1992). Identification Guide to European Passerines. ISBN 91-630-1118-2. RSPB Handbook of British Birds (2014). ISBN 978-1-4729-0647-2. Snow...25 KB (2,670 words) - 10:05, 18 April 2024
