YouTube. Prof. Arjen Hoekstra on Virtual Water, The Water Footprint of Modern Society.
Chicago-čujuhus (17. p.)YouTube. Prof. Arjen Hoekstra on Virtual Water, The Water Footprint of Modern Society.
MLA-čujuhus (9. p.)YouTube. Prof. Arjen Hoekstra on Virtual Water, The Water Footprint of Modern Society.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.