Owen, O. S. (1980). Natural resource conservation: An ecological approach (3rd ed.). Macmillan.
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Dyfyniad Arddull Chicago
Owen, Oliver S. Natural Resource Conservation: An Ecological Approach. 3rd ed. London: Macmillan, 1980.
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Dyfyniad MLA
Owen, Oliver S. Natural Resource Conservation: An Ecological Approach. 3rd ed. Macmillan, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.