Literature

Millington, Jon, Early Combination Padlocks. Bristol 2010.
Pall, Martina, Das Europäische Vorhänghängeschloss / the European padlock. Hanns Schell Collection. Graz 2009.
Tanavoli, Parviz and Wertime, John T. Locks from Iran. Pre-Islamic to Twentieth Century. Smithsonian Institute 1976.