Yaser Khaled Al-Sakkaf. “Usability of Heritage Building Materials: A Case Study of Hadhramaut (Yemen) and Najran (Saudi Arabia)”. BIMA JOURNAL OF SCIENCE AND TECHNOLOGY GOMBE 9, no. 1B (April 30, 2025): 304-315. Accessed October 3, 2025. https://journal-academia.com/Ojs/index.php/bimajst/article/view/940.