R, Uchida, “Essential Nutrients for Plant Growth: Nutrient Functions and Deficiency Symptoms. Plant Nutrient Management in Hawaii’s soils,” College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, 2000, pp. 31-55.
 M. K. Abbas, A. Majeed, A. Sadiq and S. R. Khan, “Application of Bradyrhizobium japonicum and Phosphorus Fertilization Improved Growth, Yield and Nodulation of Soybean in the Sub-Humid Hilly Region of Azad Jammu and Kashmir Pakistan,” Plant Production Science, Vol. 11, No. 3, 2008, pp. 368-376.
 J. H. J. R. Makoi, S. Bambara and P. A. Ndakidemi, “Rhizobium Inoculation and the Supply of Molybdenum and Lime Affect the Uptake of Macronutrients in Common Bean (P. vulgaris L.) Plants,” Australian Journal of Crop Science, Vol. 7, No. 6, 2013, pp. 784-793.
 P. A. Ndakidemi, F. D. Dakora, E. M. Nkonya, D. Ringo and H. Mansoor, “Yield and Economic Benefits of Common Bean (Phaseolus vulgaris) and Soybean (Glycine max) Inoculation in Northern Tanzania,” Australian Journal of Experimental Agriculture, Vol. 46, No. 4, 2006, pp. 571-577.
 P. Gyaneshwar, G. N. Kumar, L. J. Parekh and P. S. Poole, “Role of Soil Microorganisms in Improving P Nutrition of Plants,” Plant and Soil, Vol. 245, No. 1, 2002, pp. 83-93. http://dx.doi.org/10.1023/A:1020663916259
 M. Q. Shahid, M. F. Saleem, H. Z. Khan and S. A. Anjum, “Performance of Soybean (Glycine max L.) under Different Phosphorus Levels and Inoculation,” Pakistan Journal of Agricultural Sciences, Vol. 46, No. 4, 2009, pp. 237-241.
 A. Singh, A. Baoule, H. G. Ahmed, A. U. Dikko, U. Aliyu, M. B. Sokoto, J. Alhassan, M. Musa and B. Haliru, “Influence of Phosphorus on the Performance of Cowpea (Vigna unguiculata (L) Walp.) Varieties in the Sudan Savanna of Nigeria,” Agricultural Sciences, Vol. 2, No. 3, 2011, pp. 313-317.
 S. Perveen, M. S. Khan and A. Zaidi, “Effect of Rhizospheric Microorganisms on Growth and Yield of Greengram (Phaseolus radiatus),” Indian Journal of Agricultural Sciences, Vol. 72, No. 7, 2002, pp. 421-423.
 M. S. Khan and A. Zaidi, “Synergistic Effects of the Inoculation with Plant Growth-Promoting Rhizobacteria and an Arbuscular Mycorrhizal Fungus on the Performance of Wheat,” Turkish Journal of Agriculture & Forestry, Vol. 31, No. 6, 2007, pp. 355-362.
 F. Ahmad, I. Ahmad and M. S. Khan, “Screening of Free-Living Rhizospheric Bacteria for Their Multiple Plant Growth Promoting Activities,” Microbiology Research, Vol. 163, No. 2, 2008, pp. 173-181.
 Y. Wang, H. N. Brown, D. E. Crowley and P. J. Szaniszlo, “Evidence for Direct Utilization of a Siderophore, Ferrioxamine B, in Axenically Grown Cucumber,” Plant Cell and Environment, Vol. 16, No. 5, 1993, pp. 579-585.
 M. H. Abd-Alla, “Phosphatases and the Utilization of Organic P by Rhizobium leguminosarum Biovar Viceae,” Letters Applied Microbiology, Vol. 18, No. 5, 1994, pp. 294-296.
 I. A. EI-Ghandour, M. A. O. EI-Sharawy and E. M. Abdel-Moniem, “Impact of Vesicular Arbuscular Mycorrhizal Fungi and Rhizobium on the Growth and P, N and Fe Uptake by Faba-Bean,” Fertilizer Research, Vol. 43, No. 1-3, 1996, pp. 43-48.
 D. A. Phillips and F. D. Dakora, “Root Exudates as Mediators of Mineral Acquisition in Low-Nutrient Environments,” Plant and Soil, Vol. 245, No. 1, 2002, pp. 35-47.
 A. Sanon, Z. N. Andrianjaka, Y. Prin, R. Bally, J. Thioulouse, G. Comte and R. Duponnois, “Rhizosphere Microbiota Interfers with Plant-Plant Interactions,” Plant and Soil, Vol. 321, No. 1-2, 2009, pp. 259-278.
 M. Yahya-Abadi, “Evaluation of Nitrogen Fixation Potential and Nutrients up Taking in Some Common Bean Symbiosis Bacteria,” Proceeding of 10th Iranian Congress of Crop Production and Plant Breeding, 19-21 August, Karaj, Iran, 2008, p. 75.
 S. K. Dubey, “Co-Inoculation of Phosphorus Bacteria with Bradyrhizobium japonicum to Increase Phosphate Availability to Rainfed Soybean in Vertisol,” Journal of the Indian Society of Soil Science, Vol. 45, No. 3, 1997, pp. 506-509.
 A. Hussain, A. Ali and I. R. Noorka, “Effect of Phosphorus with and without Rhizobium Inoculation on Nitrogen and Phosphorus Concentration and Uptake by Mungbean (Vigna radiate L.),” Journal of Agricultural Research, Vol. 50, No. 1, 2012, p. 49.