United States. National Capital Park and Planning Commission. (1950). Open spaces and community services: A portion of the comprehensive plan for the national capital and its environs. The Commission.
Cita Chicago (17th ed.)United States. National Capital Park and Planning Commission. Open Spaces and Community Services: A Portion of the Comprehensive Plan for the National Capital and Its Environs. Washington: The Commission, 1950.
Cita MLA (8th ed.)United States. National Capital Park and Planning Commission. Open Spaces and Community Services: A Portion of the Comprehensive Plan for the National Capital and Its Environs. The Commission, 1950.
Atenció: Aquestes cites poden no estar 100% correctes.