APA引文

Gunaratne, L. (2010). Policy options for sustainable river sand mining in Sri Lanka. Economu and Environment Program for Southeast Asia.

Chicago Style (17th ed.) Citation

Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Singapore: Economu and Environment Program for Southeast Asia, 2010.

MLA引文

Gunaratne, L.H.P. Policy Options for Sustainable River Sand Mining in Sri Lanka. Economu and Environment Program for Southeast Asia, 2010.