The Folly Fellowship
The Folly Fellowship exists to promote the enjoyment, awareness and preservation of follies. Members receive regular newsletters and invitations to visits to follies in very sociable company. www.follies.org.uk
A gazetteer of follies, listed by county, illustrated with a fine collection of old postcards and modern photographs. – http://www.fabulous follies.net
A Facebook group for anyone interested in follies https://www.facebook.com/groups/447186618695453
The Gardens Trust Blog
A weekly post by Dr David Marsh on a garden history related subject https://thegardenstrust.blog/
Barbara Jones Follies and Grottoes, first published 1953 and the heavily updated 2nd edition in 1974. The first text to look at follies and garden buildings in detail.
Gwyn Headley & Wim Meulenkamp Follies, Grottoes & Garden Buildings, 1999. The authors had published earlier folly texts, but this edition was published as an invaluable county-by-county guide.
Gwyn Headley & Wim Meulenkamp The English Folly, 2020. This new volume puts the emphasis on the people who built follies.
The newsletters and journals of The Folly Fellowship are also a valuable resource, as well as the foll-e bulletins published between 2007 and 2014, which are available on the website http://follies.org.uk/index.php/e-bulletin/