Ask HN: What programming language book(s) are you reading?

My question was inspired by some of the recent (or somewhat earlier) HN threads about programming languages, which I have always been interested in, as a developer (but not an implementor).

Some of those recent threads are about Rust, of which there are many these days, Lisp, Python, BASIC or Visual BASIC, and this one about Perl:

https://news.ycombinator.com/item?id=39227169

Thanks in advance to all who REPLy ;)