R, S. kumar. “Screening of ESBL (Extended Spectrum of β - Lactamases) and Amp C β - Lactamases Producers Among Pathogens Causing Urinary Tract Infections”. International Journal of Pharmaceutical & Biological Archive, vol. 2, no. 5, Nov. 2011, http://ijpba.info/index.php/ijpba/article/view/441.