Improving vaccination coverage in urban areas through a health communication campaign: the 1990 Philippine experience.

অনুযায়ী Zimicki, S., Hornik, R. C., Verzosa, C. C., Hernandez, J. R., de Guzman, E., Dayrit, M., Fausto, A., Lee, M. B., Abad, M.
প্রকাশিত 1994