United States. Postmaster General. (1928). Improper return of undeliverable double post cards. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Postmaster General. Improper Return of Undeliverable Double Post Cards. Washington: U.S. GPO, 1928.
MLA (9th ed.) CitationUnited States. Postmaster General. Improper Return of Undeliverable Double Post Cards. U.S. GPO, 1928.
Warning: These citations may not always be 100% accurate.