1. Anstis, S.T. 2004. Penicillium radicum: Studies on the mechanisms of plant growth promotion in wheat. PhD thesis, The University of Adelaide, Australia.
2. Bandurski, R. 1980. Plant Growth Substances, pp. 37–49. In Skoog, F. (ed.), Springer-Verlag, Berlin. Heidelberg. New York, N.Y., USA.
3. Bandurski, R. 1984. Biosynthesis and Metabolism of Plant Hormones, pp. 183–200. In Crozier A. Hillman (ed.). Cambridge Uni. Press. Cambridge, UK.
4. Bashan, Y. and Holguin, G. 1998. Proposal for the division of plant growth promoting rhizobacteria into two classifications: Biocontrol-PGPB (Plant Growth-Promoting Bacteria) and PGPB. Soil Biol. Biochem. 30, 1225–1228.
5. Bashan, Y., Holguin, G., and de-Bashan, L.E. 2004. Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances (1997–2003). Can. J. Microbiol. 50, 521–577.