1. Transport Investment and Economic Development;Banister,1999
2. Implementing a Statewide Goods Movement Strategy and Performance Measurement of Goods Movement in California;Barber,2001
3. Bureau of Transportation Statistics, 2003. Table C-4: US Merchandise Trade and Production of Tradable Goods in GDP: 1970–2000 in US International Trade and Freight Transportation Trends. BTS Report 03-02.
4. Bureau of Transportation Statistics, 2006. Table I-46a: US Ton-Miles of Freight in National Transportation Statistics, Washington DC, BTS.
5. Economics of Urban Freight Transport;Button,1981