1. Center for Diseases Control and Prevention (CDC). MMWR updated guidelines for evaluating public health surveillance systems: recommendations from the guidelines working group. 2014;(July 2001).
2. Michael Gregg, editor. Field Epidemiology. 3rd Edition. Oxford: Oxford university press; 2008.
3. Measure Evaluation. Health information system strengthening: Standards and best practices for data sources. :80–7. Available from:
https://www.measureevaluation.org/resources/publications/tr-17-225/
. Accessed 25 Apr 2019.
4. U.S. Department of Health and Human Services Center for Diseases Control and Prevention (CDC). Principles of epidemiology in public health practice: an introduction to applied epidemiology and biostatistics. 3rd Edit ed; 2012.
5. Ethiopian Public Health Institute. Public health emergency management guidelines for Ethiopia. 2012;(February).