S. S. Supriyanto, Z. Zulfikar, S. Makmun, and S. Muhiddin, “The Role of Kyai in Pesantren Business Development: A Case Study on Leadership in The Traditional Pesantrens”, Sigmagri; Res. J. Soc. Agric. Policies, Econ. Agribus., vol. 2, no. 1, pp. 27–34, Jun. 2022.