Dyfyniad APA

Ohanian, H. C., & Ruffini, R. (2013). Gravitation and spacetime (3rd ed.). Cambridge University Press.

Dyfyniad Arddull Chicago

Ohanian, Hans C., and Remo Ruffini. Gravitation and Spacetime. 3rd ed. Cambridge: Cambridge University Press, 2013.

Dyfyniad MLA

Ohanian, Hans C., and Remo Ruffini. Gravitation and Spacetime. 3rd ed. Cambridge University Press, 2013.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.