Searching for books is easier when you have a more specific topic. You can also consult the Library of Congress (LoC) classification system to fidm your topic:
All Books at Rowan
To find books use Rowan's Library Search and limit the material type to Books. You can do this either from the Advanced Search page (use the Material Type drop-down menu on the right) or from a search results page (use the Resource Type limiter).
Select E-Books at RU
See search tips on e-Book Central's homepage.
Can't find it in Library Search? You can get the book on loan from another library through E-ZBorrow (12-week loan) or Interlibrary Loan.
Use Worldcat to search for books at libraries across the world.
There are resources with free access to e-books, you can search in here for your topic: