SpringerLink (Online service), Röser, H., & Meisenheimer, K. (1999). The Radio Galaxy Messier 87: Proceedings of a Workshop Held at Ringberg Castle, Tegernsee, Germany, 15-19 September 1997 (1st ed. 1999.). Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/BFb0106412
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Hermann-Josef Röser, και Klaus Meisenheimer. The Radio Galaxy Messier 87: Proceedings of a Workshop Held at Ringberg Castle, Tegernsee, Germany, 15-19 September 1997. 1st ed. 1999. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/BFb0106412.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. The Radio Galaxy Messier 87: Proceedings of a Workshop Held at Ringberg Castle, Tegernsee, Germany, 15-19 September 1997. 1st ed. 1999. Springer Berlin Heidelberg : Imprint: Springer, 1999. https://doi.org/10.1007/BFb0106412.
