Fraser A, Goldberg E, Acosta CJ, Paul M, Leibovici L (2007). Fraser, Abigail, ed. "Vaccines for preventing typhoid fever". Cochrane Database Syst Rev (3): CD001261. doi:10.1002/14651858.CD001261.pub2. PMID17636661.Pemeliharaan CS1: Banyak nama: authors list (link)
Fraser A, Goldberg E, Acosta CJ, Paul M, Leibovici L (2007). Fraser, Abigail, ed. "Vaccines for preventing typhoid fever". Cochrane Database Syst Rev (3): CD001261. doi:10.1002/14651858.CD001261.pub2. PMID17636661.Pemeliharaan CS1: Banyak nama: authors list (link)