(1999). OECD historical statistics (1999 edition.). OECD.
Chicago-čujuhus (17. p.)OECD Historical Statistics. 1999 edition. Paris, Cedex, France: OECD, 1999.
MLA-čujuhus (9. p.)OECD Historical Statistics. 1999 edition. OECD, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.