Khaled Al-Sakkaf, Y. . “Usability of Heritage Building Materials: A Case Study of Hadhramaut (Yemen) and Najran (Saudi Arabia)”. BIMA JOURNAL OF SCIENCE AND TECHNOLOGY (2536-6041), vol. 9, no. 1B, Apr. 2025, pp. 304-15, https://www.journals.gjbeacademia.com/index.php/bimajst/article/view/961.