RIZQY, L. L. et al. The Administration of Orange Sweet Potato (Ipomoea Batatas L.) Extract Increases Sperm Consentration, Mortility and Viability in Male Mice Exposed to Cigarette Smoke. Sains Medika: Jurnal Kedokteran dan Kesehatan, v. 8, n. 1, p. 34–38, 4 Apr.2017.