United Nations Environment Programme & UNEP. Global Environment Outlook 4: Evironment for development. GEO-4: evironment for development.
Chicago-čujuhus (17. p.)United Nations Environment Programme juo UNEP. Global Environment Outlook 4: Evironment for Development. GEO-4: Evironment for Development. UNEP. EARTHSCAN.
MLA-čujuhus (9. p.)United Nations Environment Programme juo UNEP. Global Environment Outlook 4: Evironment for Development. GEO-4: Evironment for Development.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.