APA (7th ed.) Citation

Risley, A. S. (1976). The national measurement system for time and frequency. U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

Risley, A. S. The National Measurement System for Time and Frequency. Washington: U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1976.

MLA (8th ed.) Citation

Risley, A. S. The National Measurement System for Time and Frequency. U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1976.