Robert F Keefer. (2000). Handbook of soils for landscape architects. Oxford University press.
शिकागो स्टाइल उद्धरणRobert F Keefer. Handbook of Soils for Landscape Architects. New York: Oxford University press, 2000.
एमएलए उद्धरणRobert F Keefer. Handbook of Soils for Landscape Architects. Oxford University press, 2000.
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