Gaya APA

selwyn, S. (1980). The Beta-Lactam Antibiotics: Penicillins and Cephalosporins in Perspective . London: hodder and stoughton.

Gaya MLA

selwyn, Sydney. "The Beta-Lactam Antibiotics: Penicillins and Cephalosporins in Perspective ". London: hodder and stoughton, 1980. Text.