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- Profitable organic farming [elektronický zdroj] / Jon Newton. [S.l.] : Wiley online library, 2007 . xv, 176 s.
https://onlinelibrary.wiley.com/doi/book/10.1002/9780470995525
book
- Soil organic matter [elektronický zdroj] : ecology, environmental impact and management / Pedro A. Bjčorklund and Frederick V. Mello, editors. New York, N.Y. : Nova Science Publishers, c2012 . 1 online zdroj (x, 147 s.)
http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=541668book
- Soil organic matter : ecology, environmental impact and management / Pedro A. Björklund and Frederick V. Mello, editors. New York : Nova Science Publishers, [2012] ©2012 . 1 online zdroj (x, 140 stran)
http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&AN=541668book