Nainggolan, Rosita, Christian Daniel Hermes, and Humala Sitinjak. “The Strength Of Evidence Of Invoice Bonus As A Debt Binding Agreement”. LEGAL BRIEF 11, no. 5 (November 30, 2022): 2852–2856. Accessed August 9, 2026. https://legal.isha.or.id/index.php/legal/article/view/709.