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http://www.springernature.com/gp/open-research/journals-books/books/the-oa-effectDer Bericht aus dem Hause Springer über Open-Access-Monografien zeigt:"Downloaded seven times more: On average, there are just under 30,000 chapter downloads per OA book within the first year of publication, which is 7 times more than for the average non-OA book.· Cited 50% more: Citations are on average 50% higher for OA books than for non-OA books, over a four-year period.· Mentioned online ten times more: OA books receive an average of 10 times more online mentions than non-OA books, over a three-year period."