International Workshop WG Rolduc, Rheinisch-Westfälische Technische Hochschule Aachen. Lehrstuhl für Informatik III, & Nagl, M. (1990). Graph-theoretic concepts in computer science: 15th International Workshop WG '89, Castle Rolduc, The Netherlands, June 14-16, 1989 : proceedings. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInternational Workshop WG Rolduc, Rheinisch-Westfälische Technische Hochschule Aachen. Lehrstuhl für Informatik III, और Manfred Nagl. Graph-theoretic Concepts in Computer Science: 15th International Workshop WG '89, Castle Rolduc, The Netherlands, June 14-16, 1989 : Proceedings. Berlin ; New York: Springer-Verlag, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रInternational Workshop WG Rolduc, et al. Graph-theoretic Concepts in Computer Science: 15th International Workshop WG '89, Castle Rolduc, The Netherlands, June 14-16, 1989 : Proceedings. Springer-Verlag, 1990.