AL-Qasab, G. H., and J. H. Rasheed. “Comparison Between Cowpea, Vigna Radiate L., Plants Differentiated from Explain Callus and Seeds Plants in Their Ability to Produce Nitrogen-Fixing Nodules”. Journal for Research in Applied Sciences and Biotechnology, vol. 2, no. 2, May 2023, pp. 155-60, doi:10.55544/jrasb.2.2.22.