APA-viite (7. p.)
Organisation for Economic Co-operation and Development & ProQuest (Firm). (2007). OECD environmental performance reviews: Belgium. OECD.
Chicago-viite (17. p.)
Organisation for Economic Co-operation and Development ja ProQuest (Firm). OECD Environmental Performance Reviews: Belgium. Paris: OECD, 2007.
MLA-viite (9. p.)
Organisation for Economic Co-operation and Development ja ProQuest (Firm). OECD Environmental Performance Reviews: Belgium. OECD, 2007.
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