International Review for Environmental Strategies. Institute for Global Environmental Strategies.
Chicago-čujuhus (17. p.)International Review for Environmental Strategies. Institute for Global Environmental Strategies.
MLA-čujuhus (9. p.)International Review for Environmental Strategies. Institute for Global Environmental Strategies.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.