It seem these days everyone is writing books about Keto or Paleo.
Two authors that I like are Mark Sisson (Primal Blueprint) and Robb Wolf (The Paleo Solution and Wired to Eat) Both author started as paleo but both have recognized the benefit of keto. You might search for an author Maria Emmerich if you are interested in more of the keto way.
There is lots of stuff on line other than those I mentioned. There is not a one size fit all or a purer form but most agree on the basics.
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