I haven’t read it, but it looks like Carrots Love Tomatoes (by Louise Riotte) is a good one.

I have a large collection of ebooks on many topics, which were mostly selected after researching what books were the best on their subjects at the time that I acquired them. I don’t remember adding this one, but I’m sure I had my reasons, and it looks like it is considered a classic and has a 4.0 on goodreads. In the absence of replies with more personal recommendations, that might be a good place to start.

Edit: while rummaging through discussion of that book to try to ensure I hadn’t given terrible advice, I found at least one person saying you’re better off reading the ATTRA guide on the subject. The link they provided was dead but I believe this is the document they meant, so you might find it helpful too: https://www.theunitygardens.org/uploads/1/4/5/0/14506314/companion_planting_handout.pdf