Ahmed, Shatha T., et al. “Isolation and Characterization E. Coli O157:H7 from Meat &Cheese and Detection of Stx1, Stx2, HlyA, EaeA by Using Multiplex PCR”. Journal of Biotechnology Research Center (JOBRC), vol. 5, no. 2, June 2011, pp. 15-24, doi:10.24126/jobrc.2011.5.2.155.