Crimson seedcracker (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Crimson seedcracker" in English language version.

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birdlife.org

Clement, Peter (2010). Finches and Sparrows. Bloomsbury Publishing. p. 341. ISBN 978-1-4081-3530-3.

BirdLife International (2018). "Pyrenestes sanguineus". IUCN Red List of Threatened Species. 2018: e.T22719379A132128125. doi:10.2305/IUCN.UK.2018-2.RLTS.T22719379A132128125.en. Retrieved 12 November 2021.
Smith, Thomas Bates (1987). "Bill size polymorphism and intraspecific niche utilization in an African finch". Nature. 329 (6141): 717–719. doi:10.1038/329717a0. S2CID 4235946.

Payne, R. "Crimson Seedcracker (Pyrenestes sanguineus)". Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. Retrieved 16 July 2019.

Smith, Thomas Bates (1987). "Bill size polymorphism and intraspecific niche utilization in an African finch". Nature. 329 (6141): 717–719. doi:10.1038/329717a0. S2CID 4235946.