NCBI. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3731873/
Diakses pada 2 September 2019Medical News Today. https://www.medicalnewstoday.com/articles/322338.php#1
Diakses pada 2 Desember 2019Healthline. https://www.healthline.com/nutrition/viagra-foods
Diakses pada 2 Desember 2019Healthline. https://www.healthline.com/health/healthy-sex/how-to-increase-sex-stamina
Diakses pada 2 Desember 2019Healthline. https://www.healthline.com/health/male-sexual-performance
Diakses pada 2 Desember 2019