Cita APA (7a ed.)

Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Poland. Organisation for Economic Co-operation and Development.

Cita Chicago Style (17a ed.)

Organisation for Economic Co-operation and Development y ProQuest (Firm). Poland. Paris: Organisation for Economic Co-operation and Development, 2009.

Cita MLA (9a ed.)

Organisation for Economic Co-operation and Development y ProQuest (Firm). Poland. Organisation for Economic Co-operation and Development, 2009.