De Costa, W.A.J.M., Becher, M. and Schubert, S., 1997. Effects of water stress on nitrogen fixation of common bean (Phaseolus vulgaris L.). Journal of the National Science Foundation of Sri Lanka, 25(2), pp.83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa WAJM, Becher M, Schubert S. Effects of water stress on nitrogen fixation of common bean (Phaseolus vulgaris L.). Journal of the National Science Foundation of Sri Lanka. 1997;25(2):83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa, W. A. J. M., Becher, M., & Schubert, S. (1997). Effects of water stress on nitrogen fixation of common bean (Phaseolus vulgaris L.). Journal of the National Science Foundation of Sri Lanka, 25(2), 83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa WAJM, Becher M and Schubert S, ‘Effects of Water Stress on Nitrogen Fixation of Common Bean (phaseolus Vulgaris L.)’ (1997) 25 Journal of the National Science Foundation of Sri Lanka 83 DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa, W.A.J.M., M. Becher, and S. Schubert. 1997. “Effects of Water Stress on Nitrogen Fixation of Common Bean (phaseolus Vulgaris L.)”. Journal of the National Science Foundation of Sri Lanka 25 (2): 83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa, W.A.J.M., M. Becher, and S. Schubert. “Effects of Water Stress on Nitrogen Fixation of Common Bean (phaseolus Vulgaris L.)”. Journal of the National Science Foundation of Sri Lanka 25, no. 2 (1997): 83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022

De Costa, W. A. J. M., et al.. “Effects of Water Stress on Nitrogen Fixation of Common Bean (phaseolus Vulgaris L.)”. Journal of the National Science Foundation of Sri Lanka, vol. 25, no. 2, 1997, pp. 83–94. DOI: http://doi.org/10.4038/jnsfsr.v25i2.5022