There are some excellent discussions and definitions of "narcissist" on the PR Forum over the years.

Obama simply doesn't fit the definition, in any way.  His speeches don't typically reference himself, either.  

But Trump?   Almost everything he says he eventually brings around to being all about him.   Scary.

Re the book you're recommending - I will put it on my list of books to request the local lending library to borrow.   I'm certainly not going to spend money on it.