PurwatiS., CarmanO., and JuniorM. Z. “Feminization of Betta Fish (Betta Splendens Regan) Through Embryo Immersion in Estradiol-17β Hormone Solution at the Dosages of 400 µg/I for 6, 12, 18 and 24 Hours”. Jurnal Akuakultur Indonesia, Vol. 3, no. 3, Dec. 2007, pp. 9-13, doi:10.19027/jai.3.9-13.