Can we stop conclusively equating internal strength/skills to aiki?
They are not the same thing. It's lazy and/or dishonest to use the terms interchangeably.
Michael, I meant no offense. That is what aiki is to me. If you have a different understanding, then by all means you are entitled to it. We could discuss that in a separate thread if you'd like (though I think they've been already quite a few of those!).
Now if we could please return to the OP regarding recommended reading...