Everything here is highly recommended. I've put *s by the things I believe to be absolute musts.
- Computerphile Introduction to Lambda Calculus*
- Y Not - Adventures in Functional Programming* - truly amazing talk about recursion in Lambda Calculus
- The Universe in a Single Arrow: A Live Dive into the Lambda Calculus - React Rally 2019 talk
- Lambda Calculus Wikipedia Entry
- Recursive Functions of Symbolic Expressions and Their Computation by Machine, Part I* - John McCarthy's original paper where he introduces Lisp and S-expressions; though academic, it is surprisingly approachable
- Reagent - what it looks like to write React with a Lisp
- S-expression Wikipedia Entry
- The Future of MVC Frameworks- David Nolen's post detailing his performance gains with ClojureScript and Om, his React Cljs library
- Immutable Data and React* - Lee Byron's introduction to Immutable.js
- Introduction to HAMTs
- Understanding Clojure's Persistent Vectors
- Ideal Hash Trees - difficult, academic paper
- React Basic Conceptual Model* - React mental model as understood by Sebastian Markbåge, React core team member; these concepts help to pull everything together