APA (7th ed.) Citation

United States. Post Office Department. (1923). Ascertainment of cost of handling and transporting several classes of mail matter and conducting special services: Instruction letter A-2; weighing by subclasses and by destinations of 2nd class entered by publishers and registered news agents and count of copies and revenues. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services: Instruction Letter A-2; Weighing by Subclasses and by Destinations of 2nd Class Entered by Publishers and Registered News Agents and Count of Copies and Revenues. [Washington]: GPO, 1923.

MLA (9th ed.) Citation

United States. Post Office Department. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services: Instruction Letter A-2; Weighing by Subclasses and by Destinations of 2nd Class Entered by Publishers and Registered News Agents and Count of Copies and Revenues. GPO, 1923.