1. http://www.ich.org/products/guidelines/quality/article/quality-guidelines.html
. Accessed 27 Aug 2014
2. http://www.who.int/biologicals/Guidelines_for_Lot_Release_AFTER_ECBS_27.1.2011.pdf?ua=1
. Accessed 27 Aug 2014
3. http://www.edqm.eu/en/human-biologicals-611.html
. Accessed 27 Aug 2014
4. Jones C, Lee CK, Ahn C et al (2013) WHO meeting report: Working group on quality, safety and efficacy of typhoid Vi capsular polysaccharide conjugate vaccines, Jeju, Republic of Korea, 5–7 September 2012. Vaccine 31:4466–4469
5. http://www.who.int/biologicals/publications/trs/areas/vaccines/gmp/WHO_TRS_822_A1.pdf
and
http://www.who.int/biologicals/vaccines/good_manufacturing_practice/en
. Accessed 27 Aug 2014