Cita APA (7a ed.)

Welch, H., & Lewis, C. N. (1951). Antibiotic therapy. Medical Encyclopedia.

Cita Chicago Style (17a ed.)

Welch, Henry, y Charles N. Lewis. Antibiotic Therapy. New York: Medical Encyclopedia, 1951.

Cita MLA (8a ed.)

Welch, Henry, y Charles N. Lewis. Antibiotic Therapy. Medical Encyclopedia, 1951.