[livrem]

There is this collection of 1980's internal design documents from Flying Buffalo that you can buy:

https://www.drivethrurpg.com/en/product/296847/t-t-solo-desi...

It is old, but I do not know of any other books really on this topic. I enjoyed reading it anyway. One of the documents in it describes a simple manual algorithm for how to number the sections in a reasonable way (just randomly assigning numbers is not very reasonable, as anyone will learn from reading a book where the author did that). I implemented that in a simple pandoc filter:

https://github.com/lifelike/pangamebook