APA (7th ed.) Citation

Usher, N. A. (1976). Studies in the chemistry of penicillins and cephalosporins. [publisher not identified].

Chicago Style (17th ed.) Citation

Usher, Norman Alec. Studies in the Chemistry of Penicillins and Cephalosporins. [Place of publication not identified]: [publisher not identified], 1976.

MLA (9th ed.) Citation

Usher, Norman Alec. Studies in the Chemistry of Penicillins and Cephalosporins. [publisher not identified], 1976.