Which source published by the American Library Association includes reviews of various books and audiovisual materials?

The American Library Association publishes Booklist, which is a prominent resource known for its comprehensive reviews of a wide range of materials, including books and audiovisual products. It serves both librarians and educators by offering detailed insights and assessments of new titles, thereby helping users select appropriate materials for their collections or classrooms. The publication is particularly focused on supporting library professionals in their acquisition decisions and is highly regarded for its critical reviews that cover various genres and formats.

The other options, such as The Horn Book Magazine, while valuable in their own right, specifically focus on children's and young adult literature and may not encompass the breadth of materials addressed in Booklist. School Library Media Research is an academic journal that publishes research related to school library media programs, rather than reviews of individual materials. American Libraries is a magazine aimed at library professionals that covers news and trends in the library world but does not primarily focus on reviews of specific books or audiovisual materials. This emphasis on comprehensive reviews makes Booklist the correct answer to the question.