Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Poland. Organisation for Economic Co-operation and Development.
Chicago-Zitierstil (17. Ausg.)Organisation for Economic Co-operation and Development und ProQuest (Firm). Poland. Paris: Organisation for Economic Co-operation and Development, 2009.
MLA-Zitierstil (9. Ausg.)Organisation for Economic Co-operation and Development und ProQuest (Firm). Poland. Organisation for Economic Co-operation and Development, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.