E. Fitriyanti, A. Wulandari, I. Fahria, and S. Karimullah, “ANALYSIS OF THE LERNER INDEX OF THE HALAL FOOD INDUSTRY IN BANGKA BELITUNG FROM THE PERSPECTIVE OF IBN KHALDUN’S PRICE CONCEPT”, Asy, vol. 10, no. 1, pp. 1-23, Aug. 2025.