ProQuest (Firm). (2011). Main aggregates. OECD.
Cita Chicago (17th ed.)ProQuest (Firm). Main Aggregates. [Paris, France]: OECD, 2011.
Cita MLA (9th ed.)ProQuest (Firm). Main Aggregates. OECD, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.