Pranatia, Maria, and Anne Gunadi Martono Widjojo. “The Making of Multiple Sale and Purchase Binding Agreements (PPJB) by Negligent Landowners or Developers Before Notary”. Notary Journal 4, no. 2 (October 29, 2024): 99–118. Accessed November 20, 2025. https://ojs.uph.edu/index.php/NJ/article/view/9049.