Cita APA (7th ed.)

Organisation for Economic Co-operation and Development & ProQuest (Firm). (2011). Belgium 2011. OECD.

Cita Chicago (17th ed.)

Organisation for Economic Co-operation and Development i ProQuest (Firm). Belgium 2011. [Paris]: OECD, 2011.

Cita MLA (9th ed.)

Organisation for Economic Co-operation and Development i ProQuest (Firm). Belgium 2011. OECD, 2011.