Beyond The Lord of the Rings: Getting to Know Tolkien through his Shorter Works
https://www.teawithtolkien.com/blog/shorter-works
A primer of Tolkien's short writings, which helps put "Leaf by Niggle" into context.
The J. R. R. Tolkien Story That Makes the Case for Fantasy Fiction
For The Atlantic, writer Yosef Lindell analyzes "Leaf by Niggle" as a story that presents escapism as having social relevance.
J.R.R. Tolkien's "Leaf by Niggle": Word Pairs and Paradoxes
https://dc.swosu.edu/cgi/viewcontent.cgi?article=2824&context=mythlore
In this...