Robèrt, K. (2002). The natural step story: Seeding a quiet revolution. New Society Publishers.
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Dyfyniad Arddull Chicago
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. Gabriola Island, B.C.: New Society Publishers, 2002.
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Dyfyniad MLA
Robèrt, Karl-Henrik. The Natural Step Story: Seeding a Quiet Revolution. New Society Publishers, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.