(1987). The new environmental age. Press syndicate of th universityu.
Chicago-čujuhus (17. p.)The New Environmental Age. New York: Press syndicate of th universityu, 1987.
MLA-čujuhus (9. p.)The New Environmental Age. Press syndicate of th universityu, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.