APA-viite (7. p.)

Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Piedmont, Italy. OECD.

Chicago-viite (17. p.)

Organisation for Economic Co-operation and Development ja ProQuest (Firm). Piedmont, Italy. Paris: OECD, 2009.

MLA-viite (9. p.)

Organisation for Economic Co-operation and Development ja ProQuest (Firm). Piedmont, Italy. OECD, 2009.

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