• Parliament of the Democratic Socialist Republic of Sri Lanka - Institute Of Environmental Professionals, Sri Lanka (Incorporation) Act, No.1 of 2020 

  Unknown author (The Democratic Socialist Republic of Sri Lanka, 2020-02-28)
• Parliament of the democratic sociolist republic of Sri Lanka:national Environmental (amendent) act no.56 of 1988 

  Unknown author (Colombo:The Government Publications Bureau, 1988)
• Parliament of the democratic sociolist republic of Sri Lanka:national Environmental (amendent) act no.53 of 2000 

  Unknown author (Colombo:The Government Publications Bureau, 2000)
• Socialist republic of Sri Lanka:national environmental act no. 47 of 1980 

  Unknown author (Colombo:The Government Publications Bureau, 1980)

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