Παραπομπή APA

(2008). 20% renewable energy by 2020. Brussels: European Commission-Directorate General for Energy and Transport.

Παραπομπή Chicago Style

20% Renewable Energy By 2020. Brussels: European Commission-Directorate General for Energy and Transport, 2008.

Παραπομπή MLA

20% Renewable Energy By 2020. Brussels: European Commission-Directorate General for Energy and Transport, 2008.

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