Reading multiple books takes care of the “review” aspect. I was more thinking along the lines of a “jump start document” to get you back into the zone with Elixir after, lets say, working for a few weeks exclusively in Ruby.
I’m also not sure how (time-)effective “multiple” books are going to be - unless they make you work through a (different) substantial project. “Programming Elixir” is largely exercise based, while IIRC “Elixir in Action” has you build a key-value store (in the beginning). So between those two you should be covered and which one you start with is largely a matter of preference.
Now for additional practice you can use Études for Elixir almost immediately alongside either of those two. I really don’t see a case for also going through “Introducing Elixir”.
