Thick-billed siskin (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Thick-billed siskin" in English language version.

refsWebsite

Global rank English rank

1iucnredlist.org

88^th place

160^th place

2^nd place

2^nd place

1books.google.com

3^rd place

3^rd place

books.google.com

Robert S. Ridgely; Guy Tudor (2009). Field Guide to the Songbirds of South America: The Passerines. University of Texas Press. pp. 679–680. ISBN 978-0-292-71748-0.

doi.org

BirdLife International (2018). "Spinus crassirostris". IUCN Red List of Threatened Species. 2018: e.T22720380A132138421. doi:10.2305/IUCN.UK.2018-2.RLTS.T22720380A132138421.en. Retrieved 12 November 2021.

iucnredlist.org

BirdLife International (2018). "Spinus crassirostris". IUCN Red List of Threatened Species. 2018: e.T22720380A132138421. doi:10.2305/IUCN.UK.2018-2.RLTS.T22720380A132138421.en. Retrieved 12 November 2021.