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Website: http://www.tumblebooks.com/library/asp/about_tumblebooks.asp
Paid Mac program: http://www.tumblebooks.com/library/asp/TBUNPLUGGED_faq.asp
Paid Windows program: http://www.tumblebooks.com/library/asp/TBUNPLUGGED_faq.asp
Website: http://openlibrary.org/
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Free Android Phone app: https://play.google.com/store/apps/details?id=com.cengage.mobile.amlschooledition.android
Free iPad app: https://itunes.apple.com/us/app/classroom-organizer/id476668797?mt=8&uo=4&at=10l6SU
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