APA

Transportation Research Record nr 637, . (1977). Forecasting passenger and freight travel. Washington DC: Transportation Research Record nr 637.

Chicago

Transportation Research Record nr 637, . 1977. Forecasting passenger and freight travel. Washington DC: Transportation Research Record nr 637.

Harvard

Transportation Research Record nr 637, . (1977). Forecasting passenger and freight travel. Washington DC: Transportation Research Record nr 637.

MLA

Transportation Research Record nr 637, . Forecasting passenger and freight travel. Washington DC: Transportation Research Record nr 637. 1977.