APA (7th ed.) Citation

United States. Post Office Department. (1930). Instructions to publishers in preparation of 2nd-class matter for mailing and dispatch. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Instructions to Publishers in Preparation of 2nd-class Matter for Mailing and Dispatch. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. Post Office Department. Instructions to Publishers in Preparation of 2nd-class Matter for Mailing and Dispatch. GPO, 1930.

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