Jespersen, J., & Fitz-Randolph, J. (1977). From sundials to atomic clocks: Understanding time and frequency. US Government Printing Office.
Chicago-Zitierstil (17. Ausg.)Jespersen, James, und Jane Fitz-Randolph. From Sundials to Atomic Clocks: Understanding Time and Frequency. Washington, DC: US Government Printing Office, 1977.
MLA-Zitierstil (9. Ausg.)Jespersen, James, und Jane Fitz-Randolph. From Sundials to Atomic Clocks: Understanding Time and Frequency. US Government Printing Office, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.