World Health Organization (2019)۔ "Typhoid vaccines: WHO position paper, مارچ 2018 - Recommendations"۔ Vaccine۔ 37 (2): 214–216۔ PMID29661581۔ doi:10.1016/j.vaccine.2018.04.022
World Health Organization (2019)۔ "Typhoid vaccines: WHO position paper, مارچ 2018 - Recommendations"۔ Vaccine۔ 37 (2): 214–216۔ PMID29661581۔ doi:10.1016/j.vaccine.2018.04.022