The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "principles" appeared
2016-11-21 : Introductory statement to the plenary debate of the European Parliament on the ECB's Annual Report 20152013-06-18 : Opening remarks at the session “Rethinking the Limitations of Monetary Policy”
2012-11-23 : Rationale and principles for Financial Union
2011-11-18 : Continuity, consistency and credibility