You can upload almost any ebook format into Calibre and convert that ebook into a format that will work on your Sony as long as the ebook uploaded is not DRM'd. (DRM is a coding put on the ebook by the originator that restricts use of the ebook to a specific device).
The formats that work on your Sony without conversion are PDF, EPUB and LRF so any legally obtained copy of an ebook in those formats should work on your Sony.
You can use PDF format ebooks downloaded from many U.S. libraries, and free ebooks from this site as well as purchased ebooks from ebook stores.
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