Wahyudi, I., M. Qalfin, R. Susanti, and T. Widiatningrum. “Relationship Between Scrotal Circumference and Quality of Semen Production in Bulls: A Meta-Analysis Review”. Jurnal Sain Peternakan Indonesia, vol. 17, no. 3, Sept. 2022, pp. 159-6, https://ejournal.unib.ac.id/jspi/article/view/21904.