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A reliable source of epubs that haven't been altered beyond the author's intention would be: the author.
Is this free? Not always.
Is this high quality? Not always.
But if you prioritize the author's words as came from the author, then there you have it.
But as self help books go, they are often written with personal experience taken as universal truth or anecdotes taken as evidence, and that, IMHO, is a true danger to the mental health of others.
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