Hume, A. O.; Marshall, C. H. T. (1881). Game birds of India, Burmah and Ceylon. Vol.3. Self-published. pp.173–180. Latham, John (1790). Index ornithologicus, sive Systema Ornithologiae; complectens avium divisionem in classes, ordines, genera, species, ipsarumque varietates: adjectis synonymis, locis, descriptionibus, &c. London: Leigh & Sotheby. Distribution: Widespread across England, parts of Scotland and Northern Ireland. Less common in Wales and south-west England but they can be seen here as their range expands during the winter. Swainson, W. (1838). The cabinet cyclopaedia. Animals in menageries. London: Longman, Orme, Brown, Green & Longmans, and John Taylor. pp.277–278. Ripley, S. Dillon (1950). "Two birds about which more information is needed". J. Bombay Nat. Hist. Soc. 49 (1): 119–120.

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Jerdon, T. C. (1864). The game birds and wild fowl of India. Calcutta: Military Orphan Press. pp.176–177. Distribution: During the summer, pochards are most likely found along the east coast of England but in the winter they can be seen along almost all of the UK coastline, as well as on large lakes and estuaries inland. Rasmussen, P. C.; Anderton, J. C. (2005). Birds of South Asia: The Ripley Guide. Vol.2. Smithsonian Institution & Lynx Editions. p.78. Distribution: Widespread in England and along the Welsh coast during winter but more restricted to east and north-east England and the Midlands during summer, with some populations in parts of Scotland, Northern Ireland and the south coast of England. Hoage, R. J.; Deiss, William A. (1996). New Worlds, New Animals. Johns Hopkins University Press. p.148. ISBN 0-8018-5373-7.Johnsgard, Paul A. (161). "The Taxonomy of the Anatidae: A behavioural analysis". Ibis. 103: 71–85. doi: 10.1111/j.1474-919X.1961.tb02421.x. a b BirdLife International (2018). " Rhodonessa caryophyllacea". IUCN Red List of Threatened Species. 2018: e.T22680344A125558688. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22680344A125558688.en . Retrieved 13 November 2021. |date= / |doi= mismatch Distribution: An introduced species, the main population is in the south, central and eastern areas of England, but there are small numbers in northern England, Wales and Scotland. Blanford WT (1898). The Fauna of British India, Including Ceylon and Burma. Birds. Volume 4. Taylor and Francis, London. pp.425–426. Livezey, B. C. (1998). "A phylogenetic analysis of modern pochards (Anatidae: Aythini)" (PDF). The Auk. 113 (1): 74–93. doi: 10.2307/4088937. JSTOR 4088937.

Pink-headed Duck - British Waterfowl Association Pink-headed Duck - British Waterfowl Association

King, F. Wayne (1988). "Extant Unless Proven Extinct: The International Legal Precedent". Conservation Biology. 2 (4): 395–397. doi: 10.1111/j.1523-1739.1988.tb00205.x.Woolfenden, G. E. (1959). "Postcranial osteology of the waterfowl". Bull. Fla. State Mus. 6 (1): 183–187. Johnsgard, Paul A. (1965). "Tribe Aythyini (Pochards)". Handbook of Waterfowl Behavior. Ithaca, New York: Cornell University Press. ISBN 0-8014-0207-7. Anonymous (1875). Revised list of the vertebrated animals now or lately living in the gardens of the Zoological Society. Zoological Society of London. p.29. Oates, Eugene W. (1902). Catalogue of the collections of birds' eggs in the British Museum (Natural History). Vol.II. London: British Museum. p.143.

Ducks found in UK wetlands | WWT Ducks found in UK wetlands | WWT

Fisher, C. T., ed. (2002). A Passion for Natural History: The Life and Legacy of the 13th Earl of Derby. National Museums and Galleries on Merseyside. ISBN 1-902700-14-7. Ali, S.; Ripley, S. D. (1978). Handbook of the birds of India and Pakistan. Vol.1 (2nded.). Oxford University Press. pp.175–177. ISBN 0-19-562063-1. Distribution: During the breeding season, they’re most common northwards from the Northumberland coast and off the west coast of Scotland. During the winter, their range expands to include areas along the east and south coasts, parts of the southwest coast and some areas of the Welsh coast. Irby, L. H. (1861). "Notes on birds observed in Oudh and Kumaon". Ibis. 3 (2): 217–251. doi: 10.1111/j.1474-919X.1861.tb07456.x.

Distribution: Mainly restricted to the highlands of Scotland during the summer, their winter range includes most coastal areas, lakes, large rivers and other inland water bodies. They are particularly best looked for in north and west Britain. Inglis, C. M. (1904). "The birds of the Madhubani subdivision of the Darbhanga district, Tirhut, with notes on species noted elsewhere in the district. Part VIII". J. Bombay Nat. Hist. Soc. 16 (1): 70–75.