Hayes, D. (1977). Rays of hope: The transition to a post-petroleum world. Norton.
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Dyfyniad Arddull Chicago
Hayes, Denis. Rays of Hope: The Transition to a Post-petroleum World. New York: Norton, 1977.
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Dyfyniad MLA
Hayes, Denis. Rays of Hope: The Transition to a Post-petroleum World. Norton, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.