I compiled this short list from WorldCat.org (popular with librarian-types): http:www/worldcat.org
In no particular order . . .
Axelrod, Allen. (1997) THE INTERNATIONAL ENCYCLOPEDIA OF SECRET SOCIETIES AND FRATERNAL ORDERS. New York: Facts on File
Summary: Debunking the spurious reputations of some, detailing the authenticity of others, The International Encyclopedia of Secret Societies and Fraternal Orders contains over 800 A-to-Z entries describing the names, natures, and purposes of secret societies throughout history and around the world.
Booth, Mark. (2008) THE SECRET HISTORY OF THE WORLD: AS LAID DOWN BY SECRET SOCIETIES. Woodstock, NY: The Overlook Press.
Summary: An intellectual tour of the world's lesser-known histories offers a collection of alternate views that are drawn from a premise that history has been recorded from the corrupted perspectives of its victors.
Barrett, David V. (2008) THE ATLAS OF SECRET SOCIETIES: THE TRUTH BEHIND THE TEMPLARS, FREEMASONS AND OTHER SECRETIVE ORGANIZATIONS. London: Godsfield.
Summary: Explores quasi-spiritual political movements, revolutionary causes and secret sects from the ancient times. From Chinese Triads to the Knights Templar, and from the Thuggee Cult to the Freemasons, this work explores the motives of each society, their purpose and what we know of their mysterious practices.
If you do not choose to purchase any of these books and if you wish to find a longer list of books, I recommend you go to your local public library (or campus library, if you are in college) to find out if the library holds any of these books or others on the subject. Be sure to talk with a reference librarian. Most likely the library can borrow some or all of the books from another library for you (InterLibrary Loan) if they are not in the library collection. A librarian can use WorldCat.org and other databases to help you compile a longer list than the one I have compiled for you, too.
Also, ask the librarian's help in finding journal articles on your topic. Both public and academic libraries subscribe to expensive electronic databases indexing journal articles, with many of the articles in full-text. Most of those databases are accessible from one's home computer via the Internet and with a valid library card. With some databases, using specific subject terms will result in achieving more relevant search results. A librarian can advise on that.
Best wishes