Dyfyniad APA

Houghton, J. (1997). Global warming: :complete briefing. University Press.

Dyfyniad Arddull Chicago

Houghton, John. Global Warming: :complete Briefing. Cambridge: University Press, 1997.

Dyfyniad MLA

Houghton, John. Global Warming: :complete Briefing. University Press, 1997.

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