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: Instruction letter D-d (series D), revised Aug. 1, 1923; time and expenditures, 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: Instruction Letter D-d (series D), Revised Aug. 1, 1923; Time and Expenditures, 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: Instruction Letter D-d (series D), Revised Aug. 1, 1923; Time and Expenditures, 2nd-class Post Offices. U.S. GPO, 1922.