1. Food safety knowledge and practices of street food-vendors in Atbara City, Naher Elneel State: Sudan;Abdallah;African Journal of Biotechnology,2008
2. Acheson , D.W.K. 2014 Why don't we learn from our mistakes? Food Safety Magazine https://www.foodsafetymagazine.com/magazine-archive1/junejuly-2014/why-dont-we-learn-more-from-our-mistakes/
3. Agres , E 2015 The cumin scandal: Accidental or fraudulent http://www.foodqualityandsafety.com/article/the-cumin-scandal-accidental-or-fraudulent/
4. Agricultural Research Service (ARS) 2007 Pathogen modeling program v. 7.0 http://www.ars.usda.gov/services/software/software.htm
5. American Public Health Association (APHA) 1972 Stock number 1712-0134 Government Printing Office Washington, DC