United States. Postmaster General. (1931). Undeliverable matter bearing sender's pledge to pay return postage to be promptly returned rated with postage chargeable for its return. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Postmaster General. Undeliverable Matter Bearing Sender's Pledge to Pay Return Postage to Be Promptly Returned Rated with Postage Chargeable for Its Return. Washington: U.S. GPO, 1931.
MLA (9th ed.) CitationUnited States. Postmaster General. Undeliverable Matter Bearing Sender's Pledge to Pay Return Postage to Be Promptly Returned Rated with Postage Chargeable for Its Return. U.S. GPO, 1931.
Warning: These citations may not always be 100% accurate.