What is the author's style in Go Ask Alice by Beatrice Sparks?

Sparks presents the story as a diary, written exclusively from the first person past point of view, which provides the reader with an immediate, visceral and highly evocative sense of what Anonymous is going through. This style manifests with particular effectiveness in several of the book's key elements, including Anonymous's loneliness, her struggles to resist the temptations of drugs, and her determination to transcend the wreckage that drug use has brought into her life, right into the reader's own realm of experience. In short, reading Go Ask Alice is very much like being in the middle of Anonymous's experiences.