Orr, D. W. (2011). Hope is an Imperative: The Essential David Orr. Island Press/Center for Resource Economics. https://doi.org/10.5822/978-1-61091-017-0
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Dyfyniad Arddull Chicago
Orr, David W. Hope Is an Imperative: The Essential David Orr. Washington, DC: Island Press/Center for Resource Economics, 2011. https://doi.org/10.5822/978-1-61091-017-0.
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Dyfyniad MLA
Orr, David W. Hope Is an Imperative: The Essential David Orr. Island Press/Center for Resource Economics, 2011. https://doi.org/10.5822/978-1-61091-017-0.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.