Bibliography

• Encyclopedia Britannica © 1999; Clockworks: From Sundials to the Atomic Second website


• Britannica.com © 2000; Clockworks: Cesium Atomic Clock website


• HowThingsWork.com © 1998-2010; How Digital Clocks Work website


• University Physics: With Modern Physics by Wolfgang Bauer and Gary D. Westfall © 2011 by McGraw-Hill Companies, Inc. ISBN#9780072857368


• Physics 155: The Sundials, Meantime, and the Equation of Time ©1998 by Jim McDonald, Updated 27 March 1998. website


• Navy.mil, Cesium Atom Clocks, Cesium Atoms at Work website


• NIST.gov, NIST-F1 Cesium Fountain Atomic Clock ©2010 website