Martin Hilbert and Priscila López (2011). "The World's Technological Capacity to Store, Communicate, and Compute Information". Science332 (6025): 60–65. Bibcode:2011Sci...332...60H. ISSN0036-8075. PMID21310967. doi:10.1126/science.1200970. Free access to the article through martinhilbert.net/WorldInfoCapacity.html
Martin Hilbert and Priscila López (2011). "The World's Technological Capacity to Store, Communicate, and Compute Information". Science332 (6025): 60–65. Bibcode:2011Sci...332...60H. ISSN0036-8075. PMID21310967. doi:10.1126/science.1200970. Free access to the article through martinhilbert.net/WorldInfoCapacity.html
Martin Hilbert and Priscila López (2011). "The World's Technological Capacity to Store, Communicate, and Compute Information". Science332 (6025): 60–65. Bibcode:2011Sci...332...60H. ISSN0036-8075. PMID21310967. doi:10.1126/science.1200970. Free access to the article through martinhilbert.net/WorldInfoCapacity.html
Martin Hilbert and Priscila López (2011). "The World's Technological Capacity to Store, Communicate, and Compute Information". Science332 (6025): 60–65. Bibcode:2011Sci...332...60H. ISSN0036-8075. PMID21310967. doi:10.1126/science.1200970. Free access to the article through martinhilbert.net/WorldInfoCapacity.html