Secondary legislation should be cited by their names, dates and serial numbers, abbreviated to SIs.
Statutory Instrument: Title | Year, SI Year/Number
The Control of Noise at Work Regulations 2005, SI 2005/1643.
The Control of Noise at Work Regulations 2005, SI 2005/1643, reg 3.
The main source for EU legislation is the Official Journal of the European Union (OJ), which comprises two series: L series - official source for EU legislation and C series - information and notices.
EU legislation is freely available on EUR-Lex which links to OJ series and is better for referencing.
Include the Title [Year of publication] OJ series Issue/page numbers:
Consolidated Version of the Treaty on European Union [2008] OJ C115/13.
Legislation title [Year] OJ series issue/First page, Article number paragraph number e.g. art 4 para 2.
Consolidated Version of the Treaty on European Union [2008] OJ C115/13, art 4 para 2.
Cite Regulations, Directives, Decisions, Recommendations and Opinions by giving the legislation type, number and title, followed by publication details in the OJ. Note that the year precedes the running number in citations to Directives, but follows it in citations to Regulations.
Legislation title [Year] OJ series issue/First page
Council Directive 2002/60/EC of 27 June 2002 laying down specific provisions for the control of African swine fever and amending Directive 92/119/EEC as regards Teschen disease and African swine fever [2002] OJ L192/27.
Council Regulation (EC) 1984/2003 of 8 April 2003 introducing a system for the statistical monitoring of trade in bluefin tuna, swordfish and big eye tuna within the Community [2003] OJ L295/1
Regulation (EU) 2015/847 of the European Parliament and of the Council of 20 May 2015 on information accompanying transfers of funds and repealing Regulation (EC) No 1781/2006 OJ L 141/1, art 3 para 9.
Legislation title [Year] OJ series issue/First page
Council Regulation (EC) 139/2004 on the control of concentrations between undertakings (EC Merger Regulation) [2004] OJ L24/1