APA (7th ed.) Citation

United States. Postmaster General. (1917). U.S. war savings certificate stamps, U.S. thrift stamps. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. U.S. War Savings Certificate Stamps, U.S. Thrift Stamps. Washington: U.S. GPO, 1917.

MLA (9th ed.) Citation

United States. Postmaster General. U.S. War Savings Certificate Stamps, U.S. Thrift Stamps. U.S. GPO, 1917.

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