APA (7th ed.) Citation

United States. Bureau of Standards. (1933). Circular of the Bureau of Standards, No. 402: Sundials. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Standards. Circular of the Bureau of Standards, No. 402: Sundials. [Washington]: [s.n.], 1933.

MLA (9th ed.) Citation

United States. Bureau of Standards. Circular of the Bureau of Standards, No. 402: Sundials. [s.n.], 1933.

Warning: These citations may not always be 100% accurate.