Suhendi, M., S. Astutik, and E. Widodo. “The Validity of Agreements Made Without Authority: A Juridical Study on the Principle of Legitimacy in Civil Law”. International Journal on Advanced Science, Education, and Religion, Vol. 8, no. 1, Aug. 2025, pp. 509-15, doi:10.33648/ijoaser.v8i1.1129.