Here are some more sources where you can find free e-book versions of classic literature.
With a collection of more than 45,000 free e-books, Project Gutenberg is a volunteer effort to create and share e-books online. Search for the book you want by title.
The Open Library has more than one million free e-books available.You can easily search by the title, author, and subject.
More than 29,000 free e-books. Search by genre, choose classic, or search by title.
HathiTrust is a partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. Search title with full text.