Organisation for Economic Co-operation and Development. (1990). OECD economic surveys: Belgium - Luxembourg. Organisation for Economic Co-operation and Development.
Chicago-čujuhus (17. p.)Organisation for Economic Co-operation and Development. OECD Economic Surveys: Belgium - Luxembourg. Paris, France: Organisation for Economic Co-operation and Development, 1990.
MLA-čujuhus (9. p.)Organisation for Economic Co-operation and Development. OECD Economic Surveys: Belgium - Luxembourg. Organisation for Economic Co-operation and Development, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.