The Library of Congress, the largest library in the United States, has more than 70,000 reference books. Your local library does not have that many books, but all libraries have a good selection of reference materials. Your job is to find the right references for the information you need.
Do you want to know the location of Sri Lanka? Look in an atlas. Would you like to know what Abraham Lincoln said about slavery? Look for a book based on his life or one on the history of the United States. Do you need to find a well-known saying by a famous person? Try Bartlett's Familiar Quotations. Do you want information about violins? The Concise Oxford Dictionary of Music is a good source.
The more you know about reference materials, the easier it is to find information. Librarians are trained to know all about reference materials, and they can help you explore the reference section in your library.