* [http://www.aascu.org/WorkArea/DownloadAsset.aspx?id=6308 The Future of Digital Textbooks]
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* [http://www.inforum.com/news/4047401-free-online-textbook-use-grows-state-universities Free online textbook use grows at state universities]
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* [https://americanlibrariesmagazine.org/2016/05/31/pushing-open-textbooks/ Pushing for Open Textbooks]
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* [http://www.west-info.eu/in-poland-the-first-national-open-textbook-program-in-the-world/ In Poland the first national open-textbook program in the world]