1] The Roud Folk Music Index hosted by the Vaughan Williams Memorial Libary at https://www.vwml.org/

2] Wikipedia - http://en.wikipedia.org/ various pages

3] Mainly Norfolk - https://mainlynorfolk.info/ (1) (2)

4] Mudcat Forums - https://mudcat.org/ various pages

5] FolkInfo.org (hosted by Joe-Offer.com) at http://joe-offer.com/folkinfo/ various pages

6] "Twa Corbies." The Book of Ballads, by Charles Vess, Charles De Lint, et al, Tor, 2004.

7] “Still More Ballads and Folk-Songs from the Southern Highlands” by Mellinger E. Henry

8] “The Other Print Tradition: Essays on Chapbooks, Broadsides, and Related Ephemera” edited by Cathy Lynn Preston and Michael James Preston

9]“The Three Ravens Explicated” by Vernon V. Chatman III in “Midwest Folklore Vol. 13, No. 3.”

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If I remember more, I will post them. If you can identify a source from listening that I left out, please let me know, and I will try to do better at tracking my sources as I go in future episodes!