Hidayani, A., Fujaya, Y., Trijuno, D. and Aslamyah, S. 2016. Cow’s testicles flour as the natural hormone masculinization of Siamese fighting fish, Betta splendens Regan, 1910. Jurnal Iktiologi Indonesia. 16, 1 (Feb. 2016), 91-101. DOI:https://doi.org/10.32491/jii.v16i1.52.