(2009). Clean, Green and Blue: Singapore's Journey Towards Environmental and Water Sustainability. [s.n.].
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Chicago Style (17th ed.) Zitazioa
Clean, Green and Blue: Singapore's Journey Towards Environmental and Water Sustainability. [S.l.]: [s.n.], 2009.
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MLA (9th ed.) Zitazioa
Clean, Green and Blue: Singapore's Journey Towards Environmental and Water Sustainability. [s.n.], 2009.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.