Widianingrum, D. C., et al. “Presence of Antibiotic-Resistant in Staphylococcal Subclinical Mastitis in Several Regencies of East Java, Indonesia”. Tropical Animal Science Journal, vol. 45, no. 1, Feb. 2022, pp. 91-97, https://doi.org/10.5398/tasj.2022.45.1.91.