Roberts, P. O., & Dewees, D. N. (1971). Economic analysis for transport choice: A Charles River Associates research study. Heath Lexington Books.
Lua i Stíl Chicago (17ú heag.)Roberts, Paul O., agus Donald N. Dewees. Economic Analysis for Transport Choice: A Charles River Associates Research Study. Lexington, Mass: Heath Lexington Books, 1971.
Lua MLA (9ú heag.)Roberts, Paul O., agus Donald N. Dewees. Economic Analysis for Transport Choice: A Charles River Associates Research Study. Heath Lexington Books, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.