(1991). Conceptual problems of quantum gravity: Based on the proceedings of the 1988 Osgood Hill Conference, North Andover, Massachusetts 15 - 19 May 1988. Birkhäuser.
Chicago-Zitierstil (17. Ausg.)Conceptual Problems of Quantum Gravity: Based on the Proceedings of the 1988 Osgood Hill Conference, North Andover, Massachusetts 15 - 19 May 1988. Boston u.a: Birkhäuser, 1991.
MLA-Zitierstil (9. Ausg.)Conceptual Problems of Quantum Gravity: Based on the Proceedings of the 1988 Osgood Hill Conference, North Andover, Massachusetts 15 - 19 May 1988. Birkhäuser, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.