Secondary source books are second-hand sources written by scholars which present a new interpretation or thesis based upon a synthesis of primary sources, scholarly journal articles, and other secondary sources.
Sometimes there will be an entire book, sometimes you may have to assemble information from multiple monographs.
Secondary sources will usually have a bibliography of materials for further study, including primary sources, journal articles (which are also secondary sources), and books.
A Keyword search using a broad term will yield the most hits.
Author's Last Name, First Name. Title of the Book. Name of Publisher,
Year of Publication.