APA (7th ed.) Citation
Jaspersen, J. (1977). From sundials to atomic clocks: Understanding time and frequency. National Bureau of Standards.
Chicago Style (17th ed.) Citation
Jaspersen, James. From Sundials to Atomic Clocks: Understanding Time and Frequency. Washington: National Bureau of Standards, 1977.
MLA (9th ed.) Citation
Jaspersen, James. From Sundials to Atomic Clocks: Understanding Time and Frequency. National Bureau of Standards, 1977.
Warning: These citations may not always be 100% accurate.