Cita APA (7a ed.)

Jespersen, J., & Fitz-Randolph, J. (1999). From sundials to atomic clocks: Understanding time and frequency. U.S.Department of Commerce.

Cita Chicago Style (17a ed.)

Jespersen, James, y Jane Fitz-Randolph. From Sundials to Atomic Clocks: Understanding Time and Frequency. Gaithesburgh: U.S.Department of Commerce, 1999.

Cita MLA (8a ed.)

Jespersen, James, y Jane Fitz-Randolph. From Sundials to Atomic Clocks: Understanding Time and Frequency. U.S.Department of Commerce, 1999.