Cita APA

Ahmed, S., & Poulsom, W. J. (1990). BCG vaccination of schoolchildren in England and Wales.

Citación estilo Chicago

Ahmed, S., y W J. Poulsom. BCG Vaccination of Schoolchildren in England and Wales. 1990.

Cita MLA

Ahmed, S., y W J. Poulsom. BCG Vaccination of Schoolchildren in England and Wales. 1990.