Ferawati, F. , Purwanto, H. , Kurnia, Y. , Purwati, E.. "Microbiological Quality and Safety of Meatball Sold in Payakumbuh City, West Sumatra, Indonesia". World Academy of Science, Engineering and Technology, Open Science Index 124, International Journal of Nutrition and Food Engineering, (2017), 11(4), 337 - 341.