- Beyerninck. M.w. (1988). Botanische Zeitung. 46-50: 725-804.
- Bliss. FA (1985). In: Nitrogen Fixation and CO2 Metabolism. (Hacker, A. and Appels. HA eds). Elsevier. Amsterdam. pp. 303-310.
- Burns. R.C. and Hardy, RW.F. (1975). Nitrogen Fixation in Bacteria and Higher Plants. Springer-Verlag. N.V.
- Gordon. A.J. (1991). J. Exptl. Bot., 42: 961-967.
- Graham. PH and Temple, S.R (1984). Pl. Soil. 82: 315-327.
- Markova. H. (1983). In: Biotechnology: a Comprehensive Treatise. 8 (Rehm. H.J. and Reed. G. eds). Verlag-ehemie. Wein Keirn, pp. 217-232.
- Thakuria, D. and Talukdar. N.C. (1999). In: Annual Tech. Session. Assam Sci. Soc.. DP.c.. 1999, pp. 145.
- Vance, c.P. (1983). Annu. Rev. Microbiol., 37: 399-425.
- Vance. C.P. (1990). In: The Biochemistry of Plants, A Comprehensive Treatise. 8 (Stumff, K. and Cohn. E.E. eds). Academic Press, N.Y., pp 43-88.
- Verma. D.P.S. and Long, S.R (1983). Inter. Rev. Cytol. Suppl. 13 (Bourne, G.H. and Denielli. J.F. eds). Academic Press.. N.Y., pp. 211-245.