एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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