1. NCCLS. Methods for dilution antimicrobial susceptibility tests for bacteria that grow aerobically; Approved standard - Fifth edition. NCCLS Document M7-A5 (ISBN 1-56238-394-9). NCCLS (2000), Wayne, PA 19087-1898 USA.
2. NCCLS. Performance standards for antimicrobial susceptibility testing; Twelfth informational supplement. NCCLS Document M100-S12. (ISBN 1-56238-454-6). NCCLS (2002), Wayne, PA 19087-1898 USA.
3. NCCLS. Performance standards for antimicrobial disk susceptibility tests; Approved standard - Seventh edition. NCCLS Document M2A7. (ISBN 1-56238-393-0). NCCLS (2000), Wayne, PA 19087-1898 USA.