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

2] Wikipedia (1) (2) (3) (4) various other pages

3] “King Henry, My Son” English Traditional Songs and Carols, by Lucy Etheldred Broadwood, Boosey, 1908.

4] Mainly Norfolk (1)

5] "Lord Randall: An Anonymous Folk Ballad" by Bob Holman & Margery Snyder https://www.thoughtco.com/lord-randall-anonymous-folk-ballad-4077755

6] "9 - Lord Randall" The Ballad Book of John Jacob Niles, John Jacob Niles, University Press of Kentucky, 1961.

7] "Dylan's Hard Rain" by Jack Doyle https://www.pophistorydig.com/topics/dylans-hard-rain-1962-1963/

8] Internet Sacred Texts Archive (1)

9] Traditional Music Library at http://www.traditionalmusic.co.uk/

10] FolkInfo.org (hosted by Joe-Offer.com) at http://joe-offer.com/folkinfo/ (1) 

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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!