Gunaratne, L. (2010). Policy options for sustainable river sand mining in Sri Lanka. Economu and Environment Program for Southeast Asia.
Citace podle Chicago (17th ed.)Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Singapore: Economu and Environment Program for Southeast Asia, 2010.
Citace podle MLA (9th ed.)Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Economu and Environment Program for Southeast Asia, 2010.
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