Hey,
Your question is incomplete. Kindly tell me the name or the book so that I can suggest you better.
See,generally you can buy the books from any good bookstore or your town. You can even try to find the books in  library of your college or school,or any public library from that matter. But,you need to return the books after a specific time period.
You can even read books online. You can use Kindle for reading E-books. You can even buy books online through Amazon or Flipkart.
Hope this helps.
Good luck.