To cite a book review in MLA format, follow the following guidelines:
Author(s) of the review. "Title of the Review." Review of Title of the Book, by Author of the Book, Publisher, Publication Date, Page(s).
For example:
Smith, John. "A Critical Review of 'The Great Gatsby'." Review of The Great Gatsby, by F. Scott Fitzgerald, Penguin Books, 2013, pp. 25-30.
If the review is from an online source, include the URL at the end of the citation:
Smith, John. "A Critical Review of 'The Great Gatsby'." Review of The Great Gatsby, by F. Scott Fitzgerald, Penguin Books, 2013, pp. 25-30. www.example.com/bookreview
Remember to italicize the title of the book and the title of the review.