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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিInternational Conference on Science Parks and Innovation Centres Berlin, Germany, এবং 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.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিInternational Conference on Science Parks and Innovation Centres Berlin, Germany, এবং 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.