Inayah, I., and W. Sahani. “Preservatives Material Content of Sodium Nitrite (NaNO2) on Meat Processed (Burger) in Supermarkets and Street Vendors, Makassar City”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 3, Oct. 2015, pp. 364-9, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4674.