Yemen: the Haraz Mountains : a hiking and trekking guide ; hike or trek in a magnificient terraced landscape among the fortified villages in the Yemen mountains (Kasparek , General Tourism Development Authority, 2007)
General Tourism Development Authority (GTDA), Sana'a ; Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) GmbH. [Engl. transl.: David Conlin]