Benn, C. S., Martins, C., Rodrigues, A., Ravn, H., Fisker, A. B., Christoffersen, D., & Aaby, P. (2009). The effect of vitamin A supplementation administered with missing vaccines during national immunization days in Guinea-Bissau. Oxford University Press.

Benn, Christine Stabell, Cesario Martins, Amabelia Rodrigues, Henrik Ravn, Ane Bærent Fisker, Dorthe Christoffersen, och Peter Aaby. The Effect of Vitamin A Supplementation Administered With Missing Vaccines During National Immunization Days in Guinea-Bissau. Oxford University Press, 2009.

Benn, Christine Stabell, et al. The Effect of Vitamin A Supplementation Administered With Missing Vaccines During National Immunization Days in Guinea-Bissau. Oxford University Press, 2009.