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Millard, Wik Reynold (1. 7. 1962). „Henry Ford's Science and Technology for Rural America”. Technology and Culture. The Johns Hopkins University Press on behalf of the Society for the History of Technology. 3 (3): 247—258. JSTOR3100818. doi:10.2307/3100818.
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Deacon, Jim (5. 4. 2023). „The Nitrogen cycle and Nitrogen fixation”. Institute of Cell and Molecular Biology, The University of Edinburgh. Архивирано из оригинала 16. 01. 2013. г. Приступљено 10. 06. 2017.CS1 одржавање: Формат датума (веза)
eol.org
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Newell, C. A.; Hymowitz, T. (1. 3. 1983). „Hybridization in the Genus Glycine Subgenus Glycine Willd. (Leguminosae, Papilionoideae)”. American Journal of Botany. Botanical Society of America. 70 (3): 334—348. JSTOR2443241. doi:10.2307/2443241.
Millard, Wik Reynold (1. 7. 1962). „Henry Ford's Science and Technology for Rural America”. Technology and Culture. The Johns Hopkins University Press on behalf of the Society for the History of Technology. 3 (3): 247—258. JSTOR3100818. doi:10.2307/3100818.
Deacon, Jim (5. 4. 2023). „The Nitrogen cycle and Nitrogen fixation”. Institute of Cell and Molecular Biology, The University of Edinburgh. Архивирано из оригинала 16. 01. 2013. г. Приступљено 10. 06. 2017.CS1 одржавање: Формат датума (веза)