Dyfyniad APA

(2004). Signposts 2004: Essential data, timelines, and analyses of global trends. Worldwatch Institute.

Dyfyniad Arddull Chicago

Signposts 2004: Essential Data, Timelines, and Analyses of Global Trends. Worldwatch Institute, 2004.

Dyfyniad MLA

Signposts 2004: Essential Data, Timelines, and Analyses of Global Trends. Worldwatch Institute, 2004.

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