Sriandayani, S., T. Rampengan, H. Lestari, and N. Rampengan. “Anti-S. Typhi Vi IgG Levels in Children With and Without Typhoid Vaccinations”. Paediatrica Indonesiana, Vol. 54, no. 5, Oct. 2014, pp. 284-8, doi:10.14238/pi54.5.2014.284-8.