Ovala, F. A., and F. A. Lukman. “Legal Force of PPJB If Not Registered at the Land Office According to Article 127 Letter B of Permen ATR/KBPN Number 16 Year 2021”. The International Journal of Politics and Sociology Research, vol. 11, no. 1, June 2023, pp. 25-30, https://ijobsor.pelnus.ac.id/index.php/ijopsor/article/view/107.