1) LENNETTE, E. H.; A. BALOWS, W. J. HANS LER & J. P. TRUANT: Manual of clinical microbiology. 3 rd Ed., Amer. Soc. Microbiol., 41. Laboratory tests in chemotherapy: General considerations (SHERRIS J. C. & J. A. WASHINGTON II) pp.446-452, 1980
4) BARRY, A. L.; C. THORNBERRY, R. N. JONES, P. C. FUCHS, T. L. GAVAN & E. H. GERLACH: Reassessment of the class concept of disk susceptibility testing. Cephalothin disks versus minimal inhibitory concentrations with eleven cephalosporins. Am. J. Clin. Path. 70: 909-913, 1978
5) LENNETTE, E. H.; A. BALOWS, W. J. HANSLER & J. P. TRUANT: Manual of clinical microbiology. 3 rd Ed., Amer. Soc. Microbiol., 44. Susceptibility testing: Diffusion test procedures (BARRY A. L, & C, THORNDERRY) pp.463-474, 1980