(1971). Long-Term planning. United Nations.
Chicago-čujuhus (17. p.)Long-Term Planning. New York: United Nations, 1971.
MLA-čujuhus (9. p.)Long-Term Planning. United Nations, 1971.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.