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Tablet Competition Heats Up: Kindle Fire Captures more than Half... - Comscore, Inc.
Why Amazon ebook market is not enough – go global! | BookMachine
6.93 Billion Growth in Global E-Book Market 2021-2025 | Featuring Major Vendors Including Amazon.com Inc., Apple Inc., and Bertelsmann SE and Co. KGaA among others| Technavio
Amazon's Kindle e-readers: global market share 2008-2011 | Statista