Smolin, L. (2002). Three roads to quantum gravity. Basic Books.
Dyfyniad Arddull ChicagoSmolin, Lee. Three Roads to Quantum Gravity. New York, N.Y: Basic Books, 2002.
Dyfyniad MLASmolin, Lee. Three Roads to Quantum Gravity. Basic Books, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.