Rekha Gomathinayagam, Gomathinayagam Subramanian, Mahendra Persaud, Rajendara Persaud and Shanmugaiha Velusamy. (2021),” The studies of effect of bio fertilizers Rhizobium, Phosphobacteria, and Root Nodule Extract (R. PB, R+PB & RNE) on the growth and certain biochemical changes in the seedlings of Black Gram & Maize”, Asian Journal of Applied Science and Technology, (AJAST), Vol.5, Issue 4, pp 01-15. Read more at: here