1. J.H. Sheenan, ‘The Enchanted Ring, The untold story of Penicillin’. MIT Press, Cambridge, Massachusetts; London, England (1982).
2. E.H. Flynn (ed.), ‘Cephalosporins and Penicillins: chemistry and biology’. Academic Press, New York and London (1972).
3. J. Baddiley and E.P. Abraham, ‘Penicillin Fifty years after Fleming’. The Royal Society, London (1980).
4. Reports from Michael Barber and Associates (UK): Chemica 1, Penicillin (1986), Chemica 2, 6-APA, 7-ADCA (1986), Chemica 3, Semisynthetic Penicillins (1987), Useful Book (1991), The Manufacture of Penicillins and its derivatives (1999), The Penicillins Business (1996) and several other MBA publications.
5. J. Wilson, ‘Antibacterial products and markets’, Scrip Reports, UK (1997).