It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
knowledge book library glasses textbook information education literature stack study read paper bookshelf open school wisdom old vintage bookcase cover text research science antique bookstore retro print university wood page literary wall wooden table macro closeup closeup history map america atlas europe
Page 2017 Free-images.com. All images are Public Domain