Pertanian organik: Perbedaan antara revisi
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* [http://www.extension.org/organic%20production Organic Agriculture.] {{Webarchive|url=https://web.archive.org/web/20090429042221/http://www.extension.org/organic%20production |date=2009-04-29 }} eOrganic Community of Practice with eXtension: America's Land Grant University System and Partners.
* [http://www.snre.umich.edu/newsroom/2007-07-10/organic-farming-can-feed-the-world-u-m-study-shows Organic farming can feed the world, U-M study shows.] {{Webarchive|url=https://web.archive.org/web/20131021164831/http://www.snre.umich.edu/newsroom/2007-07-10/organic-farming-can-feed-the-world-u-m-study-shows |date=2013-10-21 }} University of Michigan News Service. July 10, 2007.
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