What is the author's style in Donnie Brasco by Joseph D. Pistone?

This novel is told by the first person point of view of FBI Agent Joe Pistone. Agent Pistone relives his six years undercover inside the Mafia world. At times there is dialog between Pistone and other characters. All of the information given in this true life story comes from Pistone first hand knowledge of events. The impact of this point of view is felt often throughout the story; Agent Pistone not only gives the information of the case, but also how he is feeling and why he made certain choices.