Cita APA (7th ed.)

United States. Bureau of Public Roads. (1963). Calibrating and testing a gravity model with a small computer. U.S. Dept. of Commerce, Bureau of Public Roads, Office of Planning.

Cita Chicago (17th ed.)

United States. Bureau of Public Roads. Calibrating and Testing a Gravity Model with a Small Computer. Washington, D.C.: U.S. Dept. of Commerce, Bureau of Public Roads, Office of Planning, 1963.

Cita MLA (8th ed.)

United States. Bureau of Public Roads. Calibrating and Testing a Gravity Model with a Small Computer. U.S. Dept. of Commerce, Bureau of Public Roads, Office of Planning, 1963.