Juliani Simalango, Y. .; Purba, H. .; Harianto, D. . LEGAL FORCE OF BINDING SALE PURCHASE AGREEMENT RELATED TO BREACH OF PERFORMANCE AND LEGAL CERTAINTY FOR THE PARTIES (STUDY OF MEDAN DISTRICT COURT DECISION NUMBER 45/PDT.G/2023/PN.MDN). SIBATIK 2025, 4, 247-262.