Khusnul Khatimah, et al. “The Effect of Using Soybean Extender on the Movement Patterns of Spermatozoa and Plasma Membrane Integrity in Bali Bull”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 60, no. 5, Dec. 2021, pp. 219-27, https://gssrr.org/JournalOfBasicAndApplied/article/view/13639.