APA (7th ed.) Citation

United States. Post Office Department. (1930). Acceptance of properly labeled sealed parcels at 3rd or 4th class rates of postage. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Acceptance of Properly Labeled Sealed Parcels at 3rd or 4th Class Rates of Postage. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. Post Office Department. Acceptance of Properly Labeled Sealed Parcels at 3rd or 4th Class Rates of Postage. GPO, 1930.

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