سليمان حيان. “An Econometric Analysis of the Costs of Rain-Fed Olive Production in Syria”. Tishreen University Journal -Biological Sciences Series 45, no. 1 (April 13, 2023): 35–44. Accessed November 25, 2024. https://journal.tishreen.edu.sy/index.php/bioscnc/article/view/14233.