APA-viite (7. p.)
ebrary, Inc. (2002). Down to earth: Georgraphic information for sustainable development in Africa. National Academy Press.
Chicago-viite (17. p.)
ebrary, Inc. Down to Earth: Georgraphic Information for Sustainable Development in Africa. Washington, D.C.: National Academy Press, 2002.
MLA-viite (9. p.)
ebrary, Inc. Down to Earth: Georgraphic Information for Sustainable Development in Africa. National Academy Press, 2002.
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