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] “121 -  Lambkin.” The New Penguin Book of English Folk Songs, by Stephen Roud and Julia C. Bishop, Penguin Books, 2014.

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

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

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

7] “Lamkin: The Motivation of Horror” by John De Witt Niles in The Journal of American Folklore Vol. 90, No. 355 (Jan. - Mar., 1977)

8] “Lambkin: A Study in Evolution” by Anne G. Gilchrist in Journal of the English Folk Dance and Song Society Vol. 1, No. 1 (Dec., 1932)

9] “The Lore of Scotland: A guide to Scottish legends” by The Estate of Jennifer Westwood, Sophia Kingshill

10] “The Denham tracts: a collection of folklore by Michael Ailabie Vol. 2"  by Michael Aislabie Denham

11] "Lamkin” by Nick Caffrey in The Living Tradition Issue 46 (Jan. 2002)

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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!