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Helenius, J., Wezel, A., & Francis, C.  (2019, February 25). Agroecology. Oxford Research Encyclopedia of Environmental Science. Retrieved 21 Jan. 2021, from https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-297.

Helenius, Juha, Alexander Wezel, and Charles A. Francis. "Agroecology." Oxford Research Encyclopedia of Environmental Science.  February 25, 2019. Oxford University Press. Date of access 21 Jan. 2021, <https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-297>

Helenius, Juha, Alexander Wezel, and Charles A. Francis. "Agroecology." Oxford Research Encyclopedia of Environmental Science. 25 Feb. 2019; Accessed 21 Jan. 2021. https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-297.