APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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