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Khammas, K. M.; Kaiser, P. (August 1992). "Pectin decomposition and associated nitrogen fixation by mixed cultures of Azospirillum and Bacillus species". Canadian Journal of Microbiology. 38 (8): 794–797. doi:10.1139/m92-129. ISSN0008-4166. PMID1458371.
Cacciari, Isabella; Lippi, Daniela; Ippoliti, Silvia; Pietrosanti, Tito; Pietrosanti, Walter (July 1989). "Response to oxygen of diazotrophic Azospirillum brasilense ? Arthrobacter giacomelloi mixed batch culture". Archives of Microbiology. 152 (2): 111–114. doi:10.1007/bf00456086. ISSN0302-8933. S2CID10850392.
Khammas, K. M.; Kaiser, P. (August 1992). "Pectin decomposition and associated nitrogen fixation by mixed cultures of Azospirillum and Bacillus species". Canadian Journal of Microbiology. 38 (8): 794–797. doi:10.1139/m92-129. ISSN0008-4166. PMID1458371.
Brady, Nyle C. (2010). Elements of the nature and properties of soils. Weil, Ray R. (Third ed.). Upper Saddle River, N.J. pp. 343–346. ISBN9780135014332. OCLC276340542.{{cite book}}: CS1 maint: location missing publisher (link)
Kennedy, Ivan R. (2001). "Biofertilisers in action". Functional Plant Biology. 28 (9): 825. doi:10.1071/pp01169. ISSN1445-4408.
Khammas, K. M.; Kaiser, P. (August 1992). "Pectin decomposition and associated nitrogen fixation by mixed cultures of Azospirillum and Bacillus species". Canadian Journal of Microbiology. 38 (8): 794–797. doi:10.1139/m92-129. ISSN0008-4166. PMID1458371.
Cacciari, Isabella; Lippi, Daniela; Ippoliti, Silvia; Pietrosanti, Tito; Pietrosanti, Walter (July 1989). "Response to oxygen of diazotrophic Azospirillum brasilense ? Arthrobacter giacomelloi mixed batch culture". Archives of Microbiology. 152 (2): 111–114. doi:10.1007/bf00456086. ISSN0302-8933. S2CID10850392.
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Sullivan, Preston (2001). Alternative Soil Amendments(PDF) (Report). Appropriate Technology Transfer for Rural Areas.