APA
Porras-Ramírez A., Alvis-Guzmán N., Rico-Mendoza A., Alvis-Estrada L., Castañeda-Orjuela C. A., Velandia-González M. P. & de la Hoz-Restrepo F. (20100720). [Cost effectiveness of influenza vaccination in children under 2 years old and elderly in Colombia]. : Revista de salud publica (Bogota, Colombia).
Chicago
Porras-Ramírez Alexandra, Alvis-Guzmán Nelson, Rico-Mendoza Alejandro, Alvis-Estrada Luís, Castañeda-Orjuela Carlos A, Velandia-González Martha P and de la Hoz-Restrepo Fernando. 20100720. [Cost effectiveness of influenza vaccination in children under 2 years old and elderly in Colombia]. : Revista de salud publica (Bogota, Colombia).
Harvard
Porras-Ramírez A., Alvis-Guzmán N., Rico-Mendoza A., Alvis-Estrada L., Castañeda-Orjuela C. A., Velandia-González M. P. and de la Hoz-Restrepo F. (20100720). [Cost effectiveness of influenza vaccination in children under 2 years old and elderly in Colombia]. : Revista de salud publica (Bogota, Colombia).
MLA
Porras-Ramírez Alexandra, Alvis-Guzmán Nelson, Rico-Mendoza Alejandro, Alvis-Estrada Luís, Castañeda-Orjuela Carlos A, Velandia-González Martha P and de la Hoz-Restrepo Fernando. [Cost effectiveness of influenza vaccination in children under 2 years old and elderly in Colombia]. : Revista de salud publica (Bogota, Colombia). 20100720.