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Diakses pada Mei 2019Healthline. https://www.healthline.com/human-body-maps/male-urethra#1
Diakses pada Mei 2019National Institute of Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/urologic-diseases/urinary-tract-how-it-works. Diakses pada Mei 2019Urology Care Foundation. https://www.urologyhealth.org/urologic-conditions/urethral-stricture-disease#Symptoms
Diakses pada Mei 2019WebMD. https://www.webmd.com/sex-relationships/guide/male-reproductive-system#2
Diakses pada Mei 2019Medline Plus. https://medlineplus.gov/ency/anatomyvideos/000121.htm
Diakses pada Mei 2019Healthline. https://www.healthline.com/symptom/pain-in-urethra
Diakses pada Mei 2019Medical News Today. https://www.medicalnewstoday.com/articles/324617.php
Diakses pada Mei 2019