1. Cooper K. E. 1963. The theory of antibiotic inhibition zones p. 4-38. In F. Kavanagh (ed.) Analytical microbiology. Academic Press Inc. New York.
2. Antibiotic sensitivity testing- report of an international collaborative study. Acta;Ericson H. M.;Pathol. Microbiol. Scand. Sect. B Suppl.,1971
3. An inocula replicating apparatus for routine testing of bacterial susceptibility to antibiotics;Steers E.;Antibiot. Chemother. (Basel),1969
4. Washington J. A. II (ed.). 1974. Laboratory procedures in clinical microbiology p. 286-297. Little Brown and Co. Boston.
5. Washington J. A. II and A. L. Barry. 1974. Dilution test procedures p. 410-417. In E. H. Lennette E. H. Spaulding and J. P. Truant (ed.) Manual of clinical microbiology 2nd ed. American Society for Microbiology Washington D.C.