Witono, Yuli, Aulanni’am ., and Simon Bambang Widjanarko. 2010. “Purification and Partial Characterization of Protease from Biduri (Calotropis Gigantea) Latex”. Jurnal Teknologi Dan Industri Pangan 18 (1): 1. https://journal.ipb.ac.id/jtip/article/view/369.