European Commission. (1996). 84/537/EEC, Council directive of 17 September 1984 on the approximation of the laws of the member states relating to the permissible sound power level of powered hand-held concrete-breakers and picks: Provisional, unrevised texts : 9 languages. Luxembourg: Office for Official Publications of the European Communities.

European Commission. 84/537/EEC, Council Directive of 17 September 1984 On the Approximation of the Laws of the Member States Relating to the Permissible Sound Power Level of Powered Hand-held Concrete-breakers and Picks: Provisional, Unrevised Texts : 9 Languages. Luxembourg: Office for Official Publications of the European Communities, 1996.

European Commission. 84/537/EEC, Council Directive of 17 September 1984 On the Approximation of the Laws of the Member States Relating to the Permissible Sound Power Level of Powered Hand-held Concrete-breakers and Picks: Provisional, Unrevised Texts : 9 Languages. Luxembourg: Office for Official Publications of the European Communities, 1996.