Labys, W. C. (1988). Recent developments in commodity modeling: A World Bank focus. International Economics Dept., World Bank.
Chicago-referens (17:e uppl.)Labys, Walter C. Recent Developments in Commodity Modeling: A World Bank Focus. Washington, D.C: International Economics Dept., World Bank, 1988.
MLA-referens (9:e uppl.)Labys, Walter C. Recent Developments in Commodity Modeling: A World Bank Focus. International Economics Dept., World Bank, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.