Cita APA

Pollard, A., Booy, R., Nadel, S., & Levin, M. (1996). Secondary cases of meningococcal disease.

Citación estilo Chicago

Pollard, A., R. Booy, S. Nadel, and M. Levin. Secondary Cases of Meningococcal Disease. 1996.

Cita MLA

Pollard, A., et al. Secondary Cases of Meningococcal Disease. 1996.