Mutlag, Khamees H., et al. “EFFICIENCY OF INOCULATION WITH INTRODUCE STRAINS OF STRAINS OF Bradyrhizobium Japonicum AND Trichoderma Harzianum ON SOYBEA GROWTH”. Diyala Agricultural Sciences Journal , vol. 5, no. 2, Dec. 2013, pp. 257-63, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/2965.