Arfah, Harton, et al. “Masculinization of Betta Fish Betta Splendens by Embryo Immersion in Extract of Purwoceng Pimpinella Alpina”. Jurnal Akuakultur Indonesia, vol. 12, no. 2, May 2015, pp. 144-9, https://doi.org/10.19027/jai.12.144-149.