U.S. Department of commerce. (1980). World population 1979.
Chicago-čujuhus (17. p.)U.S. Department of commerce. World Population 1979. 1980.
MLA-čujuhus (9. p.)U.S. Department of commerce. World Population 1979. 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.