Tobias Scheunchen (eds.), "Bāb al-Ḥadīd - باب الحديد " in The Beth Qaṭraye Gazetteer last modified January 10, 2020, https://bqgazetteer.bethmardutho.org/place/5188
  
    
      
        
          Bāb al-Ḥadīd
          باب الحديد
          
          One of the gates of the walls of Medina.
          https://bqgazetteer.bethmardutho.org/place/5188
          http://syriaca.org/place/5188
          
            Riḥlat Ibn JubayrIbn JubayrM.J. de Goeje 
            198, 199