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

2] Wikipedia https://en.wikipedia.org/ (1) (2) (3) (4) (5) various other pages

3] Mudcat Forums https://mudcat.org (1) (2) (3)

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

5] Martin Carthy on Bob Dylan interview series by Prism https://www.youtube.com/watch?v=uqM_aQuuIZo&t=32s

6] "Friends again with Paul Simon" by Colin Randall from The Telegraph https://www.telegraph.co.uk/culture/4722968/Friends-again-with-Paul-Simon.html

7] Scarborough Maritime Heritage Center website http://www.scarboroughsmaritimeheritage.org.uk/

8] "Scarborough Fair: A Traditional Yorkshire Ballad" Parts I and II by https://storiesfromscarborough.wordpress.com/

9] "A Short History of Scarborough, Yorkshire" by Tim Lambert on http://www.localhistories.org/scarborough.html

10] http://nefaeriaofetsy.blogspot.com/

12]  Witchipedia http://www.witchipedia.com/ (1) (2) (3) (4)

13] "Why Parlsey, Sage, Rosemary, and Thyme?" by Joshua Tabin on Wild Zora https://wildzora.com/blogs/news/parsley-sage-rosemary-thyme

14]  "Shakespearean Herbs" on Stems UK https://www.stemsuk.com/news-10/shakespearean-herbs.htm

15]  "What is the Significance of Parsley, Sage, Rosemary and Thyme?" by Melody Rose on Dave's Garden https://davesgarden.com/guides/articles/view/4394 

16]  "Floor Singers Welcome! Memories of Les Cousins and the Soho Folk Music Scene" by Stuart Penney on https://www.emptymirrorbooks.com/music/les-cousins-london-folk-music

17] "American Versions of the Ballad of the Elfin Knight" in The Journal of American Folklore, Vol. 7, No. 26 by the American Folklore Society

18] Internet Sacred Texts Archive http://www.sacred-texts.com/ (1)

19]  http://www.justanothertune.com/html/cambricshirt.html

20] "History of the Folk Song 'Scarborough Fair'" by Kim Ruehl on liveaboutdotcom https://www.liveabout.com/scarborough-fair-traditional-simon-and-garfunkel-1322515

21] "The Elfin Knight (1670) / Scarborough Fair (1891) / Strawberry Lane (1954) / The Lover's Tasks (1956) / Girl From The North Country (1963)" on Joops Magical Flowers http://jopiepopie.blogspot.com/2017/07/the-elfin-knight-1670-scarborough-fair.html

22] "The Garland of Flora" by Dorothea Lynde Dix, Kessinger Publishing, 1829

23] "Folklore and Symbolism of Flowers, Plants, and Trees" by Ernst and Johanna Lehner, Dover Publications, 2003

24] "Disgraceland?" by Ben Greenman in The New Yorker https://www.newyorker.com/culture/goings-on/disgraceland

25] "Paul Simon, a 'Stolen Song' and How British Folk Star Finally Forgave Him" by Tim Cooper in The Evening Standard https://www.questia.com/newspaper/1G1-119391311/paul-simon-a-stolen-song-and-how-british-folk-star

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And of course, Mark Vesey for the interview he gave. Thanks, Mark!