(1999). Environmental valuation. Edward Elgar.
Chicago-čujuhus (17. p.)Environmental Valuation. Chellcnhan: Edward Elgar, 1999.
MLA-čujuhus (9. p.)Environmental Valuation. Edward Elgar, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.