1. Department of health. Cold chain and immunization operations manual: guidelines for handling heat sensitive vaccines and pharmaceuticals. South Africa: Department of Health; 2003. p. 23–56.
2. Ministry of Public Health. Norms and standards for the expanded program on immunization of Cameroon. Cameroon: Ministry of Public Health; 2009. p. 37–53.
3. World Health Organization. Global programme for vaccines and immunization: expanded programme on immunization: safe vaccine handling: cold chain and immunizations. Geneva: World Health Organization; 1998. p. 8–21.
4. World Health Organization. Immunization in practice: module 3: the cold chain. Geneva: World Health Organization; 2004. p. 1–31.
5. Ministry of Health. Annual cold chain management: guide and record. Wellington New Zealand: Ministry of Health; 2012. p. 1–10.