Collis, B., Nikolova, I., & Martcheva, K. (1995). Information technologies in teacher education: Issues and experiences for countries in transition; proceedings of a European workshop, University of Twenty, Enchede, Netherland, February 20-23, 1994. Unesco.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Collis, Betty, Iliana Nikolova, و Katrina Martcheva. Information Technologies in Teacher Education: Issues and Experiences for Countries in Transition; Proceedings of a European Workshop, University of Twenty, Enchede, Netherland, February 20-23, 1994. Paris: Unesco, 1995.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Collis, Betty, et al. Information Technologies in Teacher Education: Issues and Experiences for Countries in Transition; Proceedings of a European Workshop, University of Twenty, Enchede, Netherland, February 20-23, 1994. Unesco, 1995.