Febrianila, Rosiana, et al. “Case Study : Dystocia on Beef Cattle in Kunir Regency of Lumajang District, East Java, Indonesia in 2015 and 2016”. KnE Life Sciences, vol. 3, no. 6, Dec. 2017, pp. 603-8, doi:10.18502/kls.v3i6.1188.