“Quality of Cauda Epididymal Spermatozoa of Ongole Crossbred Bull in Skim Milk, Tris, and Citrate Extenders Added With Egg Yolk”. 2011. Animal Production: Indonesian Journal of Animal Production 10 (1). https://jap.fapet.unsoed.ac.id/index.php/JAP/article/view/1184.