Mustofa, Zaenal, and Hiro Phakin. “The Principle of Freedom of Contract in Property Business Agreements in Indonesia”. The Eastasouth Management and Business 4, no. 02 (January 31, 2026): 313 –. Accessed February 1, 2026. https://esj.eastasouth-institute.com/index.php/esmb/article/view/906.