Tanzil, Chandra. "Biography of Poyk, Gerson." Lontar Digital Library. , 2002. Web. 26 Jan 2021. ‹http://library.lontar.org/gdl.php?mod=browse&op=read&id=jkpklontar-ldl-YL-PG-022-Gerson-MFE.mp2/mp4›.
Tanzil, Chandra (2013-03-21). Biography of Poyk, Gerson. Retrieved from http://library.lontar.org/gdl.php?mod=browse&op=read&id=jkpklontar-ldl-YL-PG-022-Gerson-MFE.mp2/mp4