Wigan, M. R. (1979). Indicators for the analysis, monitoring and planning of freight policies and activities. Australian Road Research Board.
Lua i Stíl Chicago (17ú heag.)Wigan, M. R. Indicators for the Analysis, Monitoring and Planning of Freight Policies and Activities. Vermont South, Vic.: Australian Road Research Board, 1979.
Lua MLA (8ú heag.)Wigan, M. R. Indicators for the Analysis, Monitoring and Planning of Freight Policies and Activities. Australian Road Research Board, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.