I've only read history on sites like
c64-wiki.com. The 8-bit guy on
youtube did a multi-part documentary on the history of commodore,
starting with the Vic20.
Believe it or not, for publication materials, you'd be surprised how
much original, out of print, material is available for checkout at your
local library.
Last year I was checking out books on programming 6502 assembly that was
published in the early 80s. The books were sitting on some shelf in a
university library far from me. I wouldn't be surprised if they have
good history books on the commodore for checkout. The book you're
looking for may easily be obtainable that way.
I even got recently published books on retro game programming written by
some known youtube personalities specializing on it.
I'd also check
lemon64.com forum. The volume of knowledge there is bar
none the best I've seen. If you're a user of BBS's, there's a CBM echo
on fidonet you can post on too, if looking for good suggestions.
--
Daniel
Visit me at: gopher://gcpp.world