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Mekonnen, Mesfin M.; Hoekstra, Arjen Y. (3 Nov 2015). "Global Gray Water Footprint and Water Pollution Levels Related to Anthropogenic Nitrogen Loads to Fresh Water". Environmental Science & Technology (بالإنجليزية). 49 (21): 12860–12868. Bibcode:2015EnST...4912860M. DOI:10.1021/acs.est.5b03191. ISSN:0013-936X. PMID:26440220.
Mekonnen, Mesfin M.; Hoekstra, Arjen Y. (3 Nov 2015). "Global Gray Water Footprint and Water Pollution Levels Related to Anthropogenic Nitrogen Loads to Fresh Water". Environmental Science & Technology (بالإنجليزية). 49 (21): 12860–12868. Bibcode:2015EnST...4912860M. DOI:10.1021/acs.est.5b03191. ISSN:0013-936X. PMID:26440220.
Lal, Rattan (8 Jul 2015). "World Water Resources and Achieving Water Security". Agronomy Journal (بالإنجليزية). 107 (4): 1526–1532. DOI:10.2134/agronj15.0045. ISSN:0002-1962.
Mekonnen, Mesfin M.; Hoekstra, Arjen Y. (3 Nov 2015). "Global Gray Water Footprint and Water Pollution Levels Related to Anthropogenic Nitrogen Loads to Fresh Water". Environmental Science & Technology (بالإنجليزية). 49 (21): 12860–12868. Bibcode:2015EnST...4912860M. DOI:10.1021/acs.est.5b03191. ISSN:0013-936X. PMID:26440220.
Mekonnen, Mesfin M.; Hoekstra, Arjen Y. (3 Nov 2015). "Global Gray Water Footprint and Water Pollution Levels Related to Anthropogenic Nitrogen Loads to Fresh Water". Environmental Science & Technology (بالإنجليزية). 49 (21): 12860–12868. Bibcode:2015EnST...4912860M. DOI:10.1021/acs.est.5b03191. ISSN:0013-936X. PMID:26440220.
Chapagain, A. K.; Hoekstra, A. Y. (2004). "Water footprints of nations". Value of Water Research Report Series (بالإنجليزية). Institute for Water Education. 16. Archived from the original on 2020-04-05.
Chapagain, A. K.; Hoekstra, A. Y. (2004). "Water footprints of nations". Value of Water Research Report Series (بالإنجليزية). Institute for Water Education. 16. Archived from the original on 2020-04-05.