K. Anwar, Pardi Setiawan, Muhammad Khaqim, and Hendri Hermawan Adinugraha, “Simplicity as an Ethic of Sustainable Economics from the Perspective of KH. Abdurrahman Wahid”, Reinforce: J. of Sharia Management, vol. 5, no. 2, pp. 49–64, Oct. 2026.