Like articles, books range from complete make believe (fiction) to scholarly treateses on a topic. There is no easy way to search for "scholarly books" and limit to those that meet certain criteria. Instead, it is important to know the reliable publishers in a particular field.
University Presses - University presses generally publish scholarly books.
Private Publishers - Look at the list of items published in sociology from a publisher's webpage. You can get an idea the type of items they publish from the list of titles. You can also find reviews of publishers on the web. Also, look for information for authors and see if they talk about the editorial process, reviewing process, and the types of books they publish.