Tobias Scheunchen (eds.), "ʿAbra - عبرة " in The Beth Qaṭraye Gazetteer last modified January 10, 2020, https://bqgazetteer.bethmardutho.org/place/5541
  
    
      
        
          ʿAbra
          عبرة
          
          Located on the road to Aden.
          
            ومعقر على جادة عدن وكذلك عبرة وغارة والمخنق وكلهن صغار
          
          https://bqgazetteer.bethmardutho.org/place/5541
          http://syriaca.org/place/5541
          
            Aḥsan al-taqāsīm fī maʿrifat al-aqālīmMuḥammad ibn Aḥmad Maqdisī
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