I'm a big Pressfield fan, but I'm reading his collection somewhat backwards. I was introduced to Turning Pro first. Then I read The Authentic Swing. Both amazing and has a permanent place on my desk. I got War of Art on e-book (got it free through Pressfield's website) but my husband found a special limited edition he was given from a friend in his storage and I started reading it on paper.
Most of the stuff he writes are also written in Turning Pro and The Authentic Swing, but I particularly found the concept of thinking hierarchically and territorially spot on and really fascinating.