International Symposium on Theory and Practice in Transport Economics (7th : 1977 : London, England). (1978). The contribution of economic research to transport policy decisions: Introductory reports and summary of the discussion. European Conference of Ministers of Transport (ECMT).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Symposium on Theory and Practice in Transport Economics (7th : 1977 : London, England). The Contribution of Economic Research to Transport Policy Decisions: Introductory Reports and Summary of the Discussion. London: European Conference of Ministers of Transport (ECMT), 1978.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Symposium on Theory and Practice in Transport Economics (7th : 1977 : London, England). The Contribution of Economic Research to Transport Policy Decisions: Introductory Reports and Summary of the Discussion. European Conference of Ministers of Transport (ECMT), 1978.