Regulation (EC) No 1221/2009 of the European Parliament and of the Council of 25 November 2009 on the voluntary participation by organisations in a Community eco-management and audit scheme (EMAS), repealing Regulation (EC) No 761/2001 and Commission Decisions 2001/681/EC and 2006/193/EC.

http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32009R1221:EN:NOT

ISO 14001:2004 - Environmental management systems - Requirements with guidance for use.

ISO 50001:2011 - Energy management systems - Requirements with guidance for use.

UNE 150301:2003 - Environmental management of design and development process. Design for environment.

GRI's Sustainability Reporting Guidelines (http://www.globalreporting.org)