An archaeological study of the Yemeni highland pilgrim route between Ṣanʿā' and Mecca - Thanayyān, Muḥammad ibn ʿAbd al-Raḥmān Rāshid (The British Library, British Thesis Service, 1998)
Xerocopy, published at the British Library, Document Supply centre, Boston Spa, Wetherby
PST: Dirāsa aṯarīya li-ṭarīq al-ḥaǧǧ al-yamanī al-aʿlī al-wāṣil baina Ṣanʿā' wa-Makka al-mukarrama