Joseph Lancaster (1805). “Improvements in Education, as it Respects the Industrious Classes of the Community: Containing Among Other Important Particulars, an Account of the Institution for the Education of One Thousand Poor Children, Borough Road Southwark; and of the New System of Education on which it is Conducted”, p.180
Don Tapscott (2014). “The Digital Economy ANNIVERSARY EDITION: Rethinking Promise and Peril in the Age of Networked Intelligence”, p.4, McGraw Hill Professional