APA (7th ed.) Citation

United States. Postmaster General. (1923). Ascertainment of cost of handling and transporting several classes of mail matter and conducting special services: Instruction letter C-w; record of revenues for 30-day statistical period and weight and count of pieces for last 7 days of such period. 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 C-w; Record of Revenues for 30-day Statistical Period and Weight and Count of Pieces for Last 7 Days of Such Period. Washington: U.S. GPO, 1923.

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 C-w; Record of Revenues for 30-day Statistical Period and Weight and Count of Pieces for Last 7 Days of Such Period. U.S. GPO, 1923.