Japitana, M. F., J. Hilado, and L. L. Libanan. “A Case Report and Literature Review of Fetus in Fetu – A Rare Aberration of Embryogenesis in a 22-Month Old Infant”. Philippine Journal of Pathology, Vol. 2, no. 1, Dec. 2016, p. 30, https://philippinejournalofpathology.org/index.php/PJP/article/view/44.