„Typhoid VIS”. CDC. 5/29/2012. Accesat în 15 decembrie 2015.Verificați datele pentru: |date= (ajutor)
nih.gov
ncbi.nlm.nih.gov
„Typhoid vaccines: WHO position paper”(PDF). Releve epidemiologique hebdomadaire / Section d'hygiene du Secretariat de la Societe des Nations = Weekly epidemiological record / Health Section of the Secretariat of the League of Nations. 83 (6): 49–59. . PMID18260212.
who.int
„Typhoid vaccines: WHO position paper”(PDF). Releve epidemiologique hebdomadaire / Section d'hygiene du Secretariat de la Societe des Nations = Weekly epidemiological record / Health Section of the Secretariat of the League of Nations. 83 (6): 49–59. . PMID18260212.