International Conference on Science Parks and Innovation Centres Berlin, Germany, & Allesch, J. (1989). Regional development in Europe: Recent initiatives and experiences : proceedings of the Fourth International Conference on Science Parks and Innovation Centres held in Berlin, November 12-13, 1987. W. de Gruyter.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Conference on Science Parks and Innovation Centres Berlin, Germany, و Jürgen Allesch. Regional Development in Europe: Recent Initiatives and Experiences : Proceedings of the Fourth International Conference on Science Parks and Innovation Centres Held in Berlin, November 12-13, 1987. Berlin ; New York: W. de Gruyter, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Conference on Science Parks and Innovation Centres Berlin, Germany, و Jürgen Allesch. Regional Development in Europe: Recent Initiatives and Experiences : Proceedings of the Fourth International Conference on Science Parks and Innovation Centres Held in Berlin, November 12-13, 1987. W. de Gruyter, 1989.