Khoirani, K., A. Indrawati, and S. Setiyaningsih. “Detection of Ampicillin Resistance Encoding Gene of Escherichia Coli from Chickens in Bandung and Purwakarta”. Jurnal Riset Veteriner Indonesia (Journal of The Indonesian Veterinary Research), vol. 3, no. 1, July 2019, doi:10.20956/jrvi.v3i1.6134.