APA-referens (7:e uppl.)
Organisation for Economic Co-operation and Development. (2020). The circular economy in Valladolid, Spain. OECD.
Chicago-referens (17:e uppl.)
Organisation for Economic Co-operation and Development. The Circular Economy in Valladolid, Spain. Paris: OECD, 2020.
MLA-referens (9:e uppl.)
Organisation for Economic Co-operation and Development. The Circular Economy in Valladolid, Spain. OECD, 2020.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.