Data Quotes - Page 20
James Clerk Maxwell (1873). “A Treatise on Electricity and Magnetism”, p.38
Sir George Biddell Airy (1855). “Lecture on the Pendulum-experiments at Harton Pit: Delivered in the Central Hall, South Shields, October 24, 1854”, p.4
Ernest Dimnet (1954). “The Art of Thinking”, p.113, Prabhat Prakashan
Eric S. Raymond (2001). “The Cathedral & the Bazaar: Musings on Linux and Open Source by an Accidental Revolutionary”, p.44, "O'Reilly Media, Inc."