If Rutgers does not have a book that you are looking for, you can request the book from another library. Simply go up to Services and tools, and go to "Borrow/Access/Request." Scroll down to E-ZBorrow or U-borrow. That will take you to Rutgers' partner libraries, where you can then search up the book you are looking for. E-ZBorrow is quicker, usually bringing books to you in 3-5 days. If E-ZBorrow does not have the book you're looking for, try U-Borrow.
If you are browsing within the library, you can use the Library of Congress Classification guide to assist in your search. Specific books on Islam will start with the call number 'BP', books on Turkey will be between DR401-741, DS41-326 covers Middle Eastern Countries to Iran, and DT43-154 covers Egypt.