I looked at the web page and wasn't sure how you'd go about making it into an ebook, but how about search online for the books already in ebook format? Here is
The Everlasting Man. I know it's in .lrf format, but I would think you could download it, import it into Calibre, and then convert it to epub.
Here's a link to
With Christ in the school of Prayer. That one has an epub download.
I wasn't able to find the William Wilberforce book, but try
this link. It might be possible the book you're looking for can be found under a different name.
I hope that helps!
Usually whenever I'm looking for a particular book (especially something in public domain) I'll search for it at inkmesh.com. Then I'll narrow it by free books, and sometimes by Sony books, as those will generally be epubs.