(2004). Signposts 2004: Essential data, timelines, and analyses of global trends. Worldwatch Institute.
シカゴスタイル引用形Signposts 2004: Essential Data, Timelines, and Analyses of Global Trends. Worldwatch Institute, 2004.
MLA引用形式Signposts 2004: Essential Data, Timelines, and Analyses of Global Trends. Worldwatch Institute, 2004.
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