To release a book means to make it available when a product is released onto the market, it will become available as a matter of fact. So I think you could simply use one of the sentences, but I would choose the first one. "
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AnonymousWhat sounds better (or none of them.. is good):
Each single title(book) published by us is released within a few months or
Each single title published by us is availabe on the market within a few months?