What is the author's style in A Daughter of Han; the Autobiography of a Chinese Working Woman by Lao Toai-Toai Ning?

The story is presented in first person from the perspective of Ning Lao Lao but the reader should be aware of the fact that the book is actually written by Ida Pruitt. The book is written by Pruitt "from the story told her by Ning Lao Lao." The presentation in first person is a journalistic tool, and it is used well.