1. Doubilet PM, Benson CB, Silverman SG, et al. The penis. Semin Ultrasound CT MR. 1991;12:157.
2. Carlson BM. Human embryology and developmental biology. Philadelphia: Elsevier Health Sciences; 2013.
3. Moore KL, Persaud TVN, Torchia MG. The developing human. Philadelphia: Saunders; 2011.
4. Bellinger MF. Embryology of the male external genitalia. Urol Clin North Am. 1981;8(3):375–82.
5. Sadler TW. Langman medical embryology (international ed). Auckland: Wolters Kluwer Health; 2011.