What is the author's style in Touching the Void by Joe Simpson?

The book is written in the first person, most of the time from Joe's point of view and sometimes from Simon's. It is important to note that the sections written from Simon's point of view are actually written by Joe. Joe has written those sections in first person as if he were Simon. As a prologue to the book, Joe includes excerpts from Simon's book that offers approval of Joe's book as being "true" to the story.