Organisation for Economic Co-operation and Development. (1975). Roadside obstacles: Their effects on the frequency and severity of accidents : development and evaluation of countermeasures : a report. Organisation for Economic Co-operation and Development ; sold by OECD Publications Center].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development. Roadside Obstacles: Their Effects on the Frequency and Severity of Accidents : Development and Evaluation of Countermeasures : A Report. Paris : [Washington, D.C.: Organisation for Economic Co-operation and Development ; sold by OECD Publications Center], 1975.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Organisation for Economic Co-operation and Development. Roadside Obstacles: Their Effects on the Frequency and Severity of Accidents : Development and Evaluation of Countermeasures : A Report. Organisation for Economic Co-operation and Development ; sold by OECD Publications Center], 1975.