Dyfyniad APA

Coles, P., & Ellis, G. F. R. (1997). Is the universe open or closed? Cambridge University Press.

Dyfyniad Arddull Chicago

Coles, Peter, and George Francis Rayner Ellis. Is the Universe Open or Closed? Cambridge: Cambridge University Press, 1997.

Dyfyniad MLA

Coles, Peter, and George Francis Rayner Ellis. Is the Universe Open or Closed? Cambridge University Press, 1997.

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