Retnaningsih, Heni, and I Ketut Oka Setiawan. “Annulment of a Preliminary Sales Agreement Due to Formal Defect Through Reconvention: A Case Study of Decision Number 1263 Pdt.G 2023 PN Dps”. SIGn Jurnal Hukum, vol. 7, no. 1, Apr. 2025, pp. 1-17, https://doi.org/10.37276/sjh.v7i1.418.