Gunaratne, L. (2010). Policy options for sustainable river sand mining in Sri Lanka. Economu and Environment Program for Southeast Asia.
Chicagoスタイル(17版)引用形式Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Singapore: Economu and Environment Program for Southeast Asia, 2010.
MLA(9版)引用形式Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Economu and Environment Program for Southeast Asia, 2010.
警告: この引用は必ずしも正確ではありません.