[Video] Functional Game Engine Design for the Web by Alex Kehayias, a lot of the ideas used are from this presentation

[Book, free online] Clojure for the Brave and True by Daniel Higginbotham, core clojure concepts explained

[Website] Clojure Reference clojure reference, explaining the entire language

[Website] ClojureDocs a community-powered documentation and examples repository for the Clojure programming language

[Book, free online] Game Programming Patterns by Robert Nystrom, game programming concepts explained, contains example code in cpp