Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Poland. Organisation for Economic Co-operation and Development.
Chicago-čujuhus (17. p.)Organisation for Economic Co-operation and Development juo ProQuest (Firm). Poland. Paris: Organisation for Economic Co-operation and Development, 2009.
MLA-čujuhus (9. p.)Organisation for Economic Co-operation and Development juo ProQuest (Firm). Poland. Organisation for Economic Co-operation and Development, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.