Cahyadi, Haris, et al. “Application of the Basic Principles of Prohibition of Usury and Gharar in Sharia Cooperatives in East Lombok Regency”. Jurnal Iqtisaduna, vol. 11, no. 2, Dec. 2025, pp. 477-91, doi:10.24252/iqtisaduna.v11i2.57286.