Чад (күл): өлгөләр араһындағы айырма
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<ref name="Odada">{{cite web|last1=Odada|first1=Eric O.|last2=Oyebande|first2=Lekan|last3=Oguntola|first3=Johnson A.|url=http://www.worldlakes.org/uploads/06_Lake_Chad_27February2006.pdf|title=Lake Chad: Experiences and Lessons Learned Brief|publisher=International Lake Environment Committee (ILEC) Foundation|accessdate=2008-02-15 |format=PDF |work=Managing lakes and their Basins for Sustainable Use|year=2005 |ref=harv }}</ref>
<ref name="ilec">{{cite web |work=World Lakes Database |year=1983 |url=http://wldb.ilec.or.jp/data/databook_html/afr/afr-02.html |title=Lake Chad |publisher=International Lake Environment Committee (ILEC) |ref={{sfnref|World Lakes Database|1983}} }} {{Webarchive|url=https://web.archive.org/web/20151120180949/http://wldb.ilec.or.jp/data/databook_html/afr/afr-02.html |date=2015-11-20 }}</ref>
<ref name="crisis">{{cite journal |journal=WaterNews |date=24 June 2008 |title = Vanishing Lake Chad—a water crisis in central Africa |url = http://www.circleofblue.org/waternews/world/vanishing-lake-chad-a-water-crisis-in-central-africa/ | doi = |ref={{sfnref|WaterNews|2008}} }}</ref>
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