Principal written sources
The medieval hajj route through Syria and Jordan
Early Ottoman Arabia and the Syrian hajj route
The Ottoman hajj route : motivation and ideology
Travelling on the Darb al-Hajj
Ottoman fortification in Palestine and Transjordan
The hajj route in Syria
Catalogue of hajj forts in Jordan
Catalogue of forts in Saudi Arabia
Arabic and Turkish inscriptions on the Darb al-Hajj
Excavations at Qalat Unaiza
Ceramics from at Qalat Unaiza and other hajj forts in Jordan
Finds from Qalat Unaiza and other Ottoman forts on the Darb al-Hajj.
The medieval and Ottoman hajj route in Jordan : an archaeological and historical study by Andrew Petersen. ISBN 9781842175026. Published by Oxbow Books in 2012. Publication and catalogue information, links to buy online and reader comments.