Hopkin, J. M. (1981). The role of an understanding of social factors in forecasting car ownership. Transport and Road Research Laboratory.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hopkin, Jean M. The Role of an Understanding of Social Factors in Forecasting Car Ownership. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Hopkin, Jean M. The Role of an Understanding of Social Factors in Forecasting Car Ownership. Transport and Road Research Laboratory, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.