1. Abraham EC, Chain E. An enzyme from bacteria able to destroy penicillin. Nature, 1940; 146: 837.
2. Reuck AVS, Cameron MP (Eds.) Resistance of bacteria to penicillins. Ciba Foundation Study Group No. 13. J & Churchill Ltd, London 1962.
3. Brook I. Direct and indirect pathogenicity. Adv Pediatr 1987; 34: 357-377.
4. Shilo M, Citri N. The role of penicillinase in staphylococcal infections. Br J Exptl Pathol, 1964; 45: 192-197.
5. Wilson GS, Miles AA. Topley and Wilson's Principles of Bacteriology and Immunity, Fourth Edition, Edward Arnold (Publishers) Ltd., London 1955.