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Since I was an Apple II person, I had What's Where in the Apple II.

Which is, surprisingly, available: https://www.lulu.com/en/gb/shop/phil-daley-and-william-f-lue...

For Commodore, we had the Commodore Inner Space Anthology, put out by the wonderful people who published The Transactor magazine (http://csbruce.com/cbm/transactor/).

That book was amazing. The Atari Assembler cartridge and magazines completed the picture of what you could do with the Atari 8-bit. I know there was another book I loved, but I cannot remember its name. I have them in a storage garage along with my 400 and 130XE.

I had friends who had the Action language cartridge but I never got to play with that one. Apparently there was information there about the machines internals.

Before that, De Re Atari.