FITRIE, N.; YUSGUNAWAN, E.; ICHSAN, R. N.; SIREGAR, B. A. THE SYNERGY OF LEADERSHIP AND ORGANIZATIONAL BEHAVIOR ON MARKETING MANAGEMENT EFFECTIVENESS: A CASE STUDY ON SMES IN NORTH SUMATRA. Journal of Sustainable Business, Economics and Accounting, [S. l.], v. 1, n. 1, p. 13-22, 2026. DOI: 10.47652/mjeb.v1i1.893. Disponível em: https://ejournal.steitholabulilmi.ac.id/index.php/jsbea/article/view/893. Acesso em: 21 apr. 2026.