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, vol. 4, no. 2, Oct. 2024, pp. 99–118, doi:10.19166/nj.v4i2.9049.