APA (7th ed.) Citation

Hirsh, H. L., & Putnam, L. E. (1958). Penicillin. Med. Encyclopedia.

Chicago Style (17th ed.) Citation

Hirsh, Harold L., and Lawrence E. Putnam. Penicillin. New York: Med. Encyclopedia, 1958.

MLA (9th ed.) Citation

Hirsh, Harold L., and Lawrence E. Putnam. Penicillin. Med. Encyclopedia, 1958.