Mufti, Tariq, M. Saeed Khan, Muzher -U- Dua, and Farah Waqar. 2002. “MALIGNANT SACROCOCCYGEAL YOLK SAC (ENDODERMAL SINUS) TUMOR”. Journal of Ayub Medical College Abbottabad 14 (2). https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/3906.