APA (7th ed.) Citation

(1921). Specifications for marine sextants. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Specifications for Marine Sextants. [Washington?]: U.S. Government Printing Office, 1921.

MLA (9th ed.) Citation

Specifications for Marine Sextants. U.S. Government Printing Office, 1921.

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