Cornerstone Books is a place on the web where you can easily get lost. It has information on most of the New Thought authors (especially the old ones); it has books online that you can read; and it has many ebooks you can purchase. (To read some of the books, your computer needs to support frames. So, if you can’t read the book, it’s probably not the link but your settings )
One great classic that you can read online is “As a Man Thinketh” by James Allen.
Then there’s “Character Building Thought Power” by Ralph Waldo Trine.
And look at the list they have provided of on-line books.