Roper, W. E. (2000). Managing technology in the iron and steel industry. Center for Integrative and Development Studies and the Technology Management Center.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Roper, William E. Managing Technology in the Iron and Steel Industry. University of the Philippines: Center for Integrative and Development Studies and the Technology Management Center, 2000.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Roper, William E. Managing Technology in the Iron and Steel Industry. Center for Integrative and Development Studies and the Technology Management Center, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.