He's written several books on Vlad III, it seems to be his area of specialization. You might want to check out the footnotes in the wiki article on Vlad III and see what books are used as references. Just keep in mind that not all books are ebooks, especially when you start to dig into slightly obscure topics. Most of what I've read about him tends to be a couple of brief paragraphs in a larger work on the fight between the Ottoman Empire and the West. I doubt these books would be of interest to you.
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