• Water Index in Sri Lanka 1995-2010 

  CEA (Colombo:Central Environment Authority, 18p., 2010)
• Index on tsunami 2004 - 2009 

  CEA (Colombo:Central Environment Authority, 18p., 2010)
• Index to publications of the Central Environmental Authority (1981 -1998) 

  Weerakoon, T.R.I.R. (Colombo:Central Environment Authority, 27p., 1998)
• Index to environmental legislations in Sri Lanka 1995 

  CEA (Colombo:Central Environment Authority, 36p., 1995)
• Index on national environmental act and regulations:ජාතික පාරිසරික පනත සහ නියෝග අනුක්‍රමණිකාව 2011 

  CEA (Colombo:Central Environment Authority, 11p., 2011)

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