Oriti, D. (2005). The Feynman propagator for quantum gravity: Spin foams, proper time, orientation, causality and timeless-ordering. Sociedade Brasileira de Física.
Chicago-Zitierstil (17. Ausg.)Oriti, D. The Feynman Propagator for Quantum Gravity: Spin Foams, Proper Time, Orientation, Causality and Timeless-ordering. Sociedade Brasileira de Física, 2005.
MLA-Zitierstil (9. Ausg.)Oriti, D. The Feynman Propagator for Quantum Gravity: Spin Foams, Proper Time, Orientation, Causality and Timeless-ordering. Sociedade Brasileira de Física, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.