Cita APA

John, T. J., Joseph, A., & Vijayarathnam, P. (1980). A better system for polio vaccination in developing countries?

Citación estilo Chicago

John, T J., A. Joseph, y P. Vijayarathnam. A Better System for Polio Vaccination in Developing Countries? 1980.

Cita MLA

John, T J., A. Joseph, y P. Vijayarathnam. A Better System for Polio Vaccination in Developing Countries? 1980.