PUTRANTO, H.D. (2017) “Effect of katuk (Sauropus androgynus) powder supplementation on the levels of progesterone (P4) and estradiol-17β (E2) hormones in kacang goat (Capra aegragus)”, Nusantara Bioscience, 9(1), pp. 86–91. doi:10.13057/nusbiosci/n090115.