Mohammed, A. H., Na’inna, S. Z., Yusha’u, M., Salisu, B., Adamu, U., and Garba, S. A. “In Vitro Antibacterial Activity of Psidium Guajava Leaves Extracts Against Clinical Isolates of Salmonella Specie”. UMYU Journal of Microbiology Research (UJMR), vol. 2, no. 1, June 2017, pp. 1-5, doi:10.47430/ujmr.1721.001.