APA (7th ed.) Citation

(1920). Recommended specifications for zinc oxide, dry and paste. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Recommended Specifications for Zinc Oxide, Dry and Paste. [Washington?]: U.S. Government Printing Office, 1920.

MLA (9th ed.) Citation

Recommended Specifications for Zinc Oxide, Dry and Paste. U.S. Government Printing Office, 1920.

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