Subekti, Risma, Hichmaed Tachta Hinggo S, and Ikhbal Akhmad. “Analisis Pengaruh Leverage, Firm Size, Maturity Dan Secure Terhadap Peringkat Obligasi Perusahaan Manufaktur Tahun 2015-2020”. ECOUNTBIS: Economics, Accounting and Business Journal 2, no. 1 (January 31, 2022): 255–266. Accessed May 3, 2024. https://jom.umri.ac.id/index.php/ecountbis/article/view/397.