Document of GDPR:
http://eur-lex.europa.eu/legal-content/en/TXT/?uri=CELEX%3A32016R0679

GDPR on EU web pages:
http://ec.europa.eu/justice/data-protection/reform/index_en.htm

GDPR on Wikipedia:
https://en.wikipedia.org/wiki/General_Data_Protection_Regulation 

Overview of the General Data Protection Regulation (GDPR)
https://ico.org.uk/for-organisations/data-protection-reform/overview-of-the-gdpr/ 

IT governance and GDPR:
http://www.itgovernance.co.uk/data-protection-dpa-and-eu-data-protection-regulation.aspx 

Web page related to the GDPR:
http://www.eugdpr.org/