Handoyo, Maria Violetta, and Johannes Gerardus Nirbito. “Creating the Violetta Stationary Startup Business Using the Value Proposition Canvas”. KnE Social Sciences 5, no. 5 (March 22, 2021): 82–92. Accessed October 25, 2021. https://knepublishing.com/index.php/KnE-Social/article/view/8800.