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2. Ali, S., and S. D. Ripley (1971). Handbook of the Birds of India and Pakistan, Together with Those of Nepal, Sikkim, Bhutan and Ceylon. Volume 6. Oxford University Press, Bombay, India.
3. Jenni, L., and R. Winkler (2020). Moult and Ageing of European Passerines. 2nd edition. Bloomsbury, London, United Kingdom.
4. Pyle, P. (2022). Identification Guide to North American Birds. Part I. 2nd edition. Slate Creek Press, Forest Knolls, CA, USA.
5. An Approach to the Study of Molts and Plumages