Iskandar, Puji. “Effectiveness of Black Pepper Extract (Piper Nigrum L) Against the Number and Motility of Spermatozoa”. Jurnal Ilmiah Kesehatan Sandi Husada 10, no. 2 (December 31, 2021): 683-688. Accessed June 24, 2025. https://jurnalsandihusada.polsaka.ac.id/JIKSH/article/view/677.