Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Forthcoming International Scientific and Technical Conferences. London: Department of Education and Science.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.