Nagi, H. M. H. (2021) "Delineating and Calculating the Length of Yemen’s Mainland Shoreline", International Journal of Alternative Fuels and Energy, 5(1), ص 1–9. موجود في: https://psmjournals.org/index.php/ijafe/article/view/543 (تاريخ الوصول: 19مايو2024).