International Conference on Deductive and Object-Oriented Databases Munich, Germany, Delobel, C., Kifer, M., & Masunaga, Y. (1991). Deductive and object-oriented databases: Second International Conference, DOOD '91, Munich, Germany, December 16-18, 1991 : proceedings. Springer-Verlag.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Conference on Deductive and Object-Oriented Databases Munich, Germany, C. Delobel, M. Kifer, و Y. Masunaga. Deductive and Object-oriented Databases: Second International Conference, DOOD '91, Munich, Germany, December 16-18, 1991 : Proceedings. Berlin ; New York: Springer-Verlag, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Conference on Deductive and Object-Oriented Databases Munich, Germany, et al. Deductive and Object-oriented Databases: Second International Conference, DOOD '91, Munich, Germany, December 16-18, 1991 : Proceedings. Springer-Verlag, 1991.