1. “Antibiotics and Other Secondary Metabolites”;Abraham,1978
2. A Glimpse of the Early History of the Cephalosporins
3. Aharnowitz, Y., and Demain, A. L. (1976). Abstr. Intersci., Conf. Antimicrob. Ag. Chemother., 16th, p. 49.
4. “Biochemical Engineering, 2nd Ed.,”;Aiba,1973