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Jamwal, P.S., Chandan, P. and Rattan, R. 2017. A rare sighting of the Long-tailed Duck Clangula hyemalis (Linnaeus, 1758) (Aves: Anseriformes: Anatidae) over a four-week period in northwestern India: first detailed scientific documentation in 73 years. Journal of Threatened Taxa. 9, 8 (Aug. 2017), 10631–10632. DOI:https://doi.org/10.11609/jott.3084.9.8.10631-10632.