APA (7th ed.) Citation

United States. Postmaster General. (1922). Ascertainment of cost of handling and transporting several classes of mail matter and conducting special services for purpose of making report to Joint Commission of Congress on Postal Service: Instruction letter D-T; tests of outgoing and incoming mixed mails in 1st and 2nd class post offices. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services for Purpose of Making Report to Joint Commission of Congress on Postal Service: Instruction Letter D-T; Tests of Outgoing and Incoming Mixed Mails in 1st and 2nd Class Post Offices. Washington: U.S. GPO, 1922.

MLA (9th ed.) Citation

United States. Postmaster General. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services for Purpose of Making Report to Joint Commission of Congress on Postal Service: Instruction Letter D-T; Tests of Outgoing and Incoming Mixed Mails in 1st and 2nd Class Post Offices. U.S. GPO, 1922.