Cita APA

Helleringer, S., Frimpong, J. A., Abdelwahab, J., Asuming, P., Touré, H., Awoonor-Williams, J. K., . . . Guidetti, F. (2012). Supplementary polio immunization activities and prior use of routine immunization services in non-polio-endemic sub-Saharan Africa. World Health Organization.

Citación estilo Chicago

Helleringer, Stephane, Jemima A. Frimpong, Jalaa Abdelwahab, Patrick Asuming, Hamadassalia Touré, John Koku Awoonor-Williams, Thomas Abachie, y Flavia Guidetti. Supplementary Polio Immunization Activities and Prior Use of Routine Immunization Services in Non-polio-endemic Sub-Saharan Africa. World Health Organization, 2012.

Cita MLA

Helleringer, Stephane, et al. Supplementary Polio Immunization Activities and Prior Use of Routine Immunization Services in Non-polio-endemic Sub-Saharan Africa. World Health Organization, 2012.