Roberts, Michael; Ingram, Neil (2001). Biology (2nd, illustrated ed.). Nelson Thornes. p. 105. ISBN0-7487-6238-8. Retrieved 4 March 2012. Penicillin is just one of a very large number of drugs which today are used by doctors to treat people with diseases.
Bigger, Joseph W.; Boland, C. R.; O'meara, R. A. Q. (1927). "Variant colonies ofStaphylococcus aureus". The Journal of Pathology and Bacteriology. 30 (2): 261–269. doi:10.1002/path.1700300204.
Diggins, F. W. (1999). "The true history of the discovery of penicillin, with refutation of the misinformation in the literature". British Journal of Biomedical Science. 56 (2): 83–93. PMID10695047.
Henry Harris, Howard Florey and the development of penicillin, a lecture given on 29 September 1998, at the Florey Centenary, 1898–1998, Sir William Dunn School of Pathology, Oxford University (sound recording) [1]