[12] M. Spaak, R. Otto: Revised Final Report 'Study on the Mapping of Donor Coordination (Humanitarian Aid) at the Field Level', commissioned by DG ECHO on behalf of the Good Humanitarian Donorship Initiative, 2 July 2009.
[12] M. Spaak, R. Otto, herzien eindverslag "Study on the Mapping of Donor Coordination (Humanitarian Aid) at the Field Level", studie besteld door DG ECHO ten behoeve van het initiatief voor goed humanitair donorschap, 2 juli 2009.