Frederiksen, H. D. (1992). Drought planning and water efficien-: Cy implications in water resources management. The World Bank.
Tohutoru Kātū Chicago (17th ed.)Frederiksen, Harald D. Drought Planning and Water Efficien-: Cy Implications in Water Resources Management. Washington D.C: The World Bank, 1992.
Tohutoro MLA (9th ed.)Frederiksen, Harald D. Drought Planning and Water Efficien-: Cy Implications in Water Resources Management. The World Bank, 1992.
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