1. Investment case for vaccine-preventable diseases surveillance in the African Region. 2020-2030. Brazzaville: WHO Regional Office for Africa; 2019. License: CC BY-CN-SA 3.0 IGO.
2. World Health Organization. Global vaccine-preventable diseases standards measles guide line. 2018:1–30.
3. Rewar S. Measles virus: a perpetual challenge Measles virus: a perpetual challenge. 2015.
4. WHO Regional Office for Europe. Guidelines for measles and rubella outbreak investigation and response in the WHO European Region: UN City, Marmovej 51, DK-2100 Copenhagen, Denmark, 2013.
5. Mohammed Y, Alemu AN. Measles outbreak investigation and response in Jarar Zone of Ethiopian Somali Regional State, Eastern Ethiopia. 2017.