2023. Coffee Trade during the Reign of Imam Yahya bin Mohammed Hamiduddin and His Son, Imam Ahmed Yahya Hamiduddin 1322 AH - 1382 AH / 1904 – 1962 (A Historical Documentary Study " . Sana’a University Journal of Human Sciences. 5, 1 (Nov. 2023). DOI:https://doi.org/10.59628/jhs.v5i1.586.