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Cross, Jay (July 2009). "Informal Learning 2.0". Chief Learning Officer. 8 (8). Archived from the original on February 18, 2016. Retrieved February 15, 2016.
Cross, Jay (July 2009). "Informal Learning 2.0". Chief Learning Officer. 8 (8). Archived from the original on February 18, 2016. Retrieved February 15, 2016.