Planning and Transport Research and Computation International Association. Meeting Seminar C. & PTRC Education and Research Services. (1990). Transport policy: Proceedings of Seminar C held at the PTRC Transport and Planning Summer Annual Meeting, University of Sussex, England, from 10-14 September, 1990. PTRC Education and Research Services Ltd. on behalf of The Planning and Transport Research and Computation International Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Planning and Transport Research and Computation International Association. Meeting Seminar C. و PTRC Education and Research Services. Transport Policy: Proceedings of Seminar C Held at the PTRC Transport and Planning Summer Annual Meeting, University of Sussex, England, from 10-14 September, 1990. London: PTRC Education and Research Services Ltd. on behalf of The Planning and Transport Research and Computation International Association, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Planning and Transport Research and Computation International Association. Meeting Seminar C. و PTRC Education and Research Services. Transport Policy: Proceedings of Seminar C Held at the PTRC Transport and Planning Summer Annual Meeting, University of Sussex, England, from 10-14 September, 1990. PTRC Education and Research Services Ltd. on behalf of The Planning and Transport Research and Computation International Association, 1990.