While it is important that you summarize the key ideas expressed in the book, your review should be more than a synopsis of the points made in the work. You should also analyze the argument presented by the author: What are its strengths? What are its weaknesses? What is its legacy? (Describing the legacy for On Suicide means describing its impact on subsequent research on this topic as well as upon efforts to combat this problem; Citations and references should conform to the American Sociological Association style guidelines. (A brief outline of these guidelines is available. Proper citations are a must; examples are provided in the style guide.
https://www.asanet.org/wp-content/uploads/savvy/documents/teaching/pdfs/Quick_Tips_for_ASA_Style.pdf