Dyfyniad APA

Clarke, A. C. (1984). Report on planet three and other speculations. London: Pan Books.

Dyfyniad Arddull Chicago

Clarke, Arthur C. Report On Planet Three and Other Speculations. London: Pan Books, 1984.

Dyfyniad MLA

Clarke, Arthur C. Report On Planet Three and Other Speculations. London: Pan Books, 1984.

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