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Books about Hakkak:
Robertson: Osmanli Baskentinde Fotografci Ve Hakkak / Photographer and Engraver in the Ottoman Capital by Bahattin Oztuncay (Dec 31, 2013)
Sofort im Geschäft Arabisch: Fachwortschatz und Sprachführer für Geschäftsgespräche, Deutsch und Arabisch: Arabisch... by Ghalib Al-Hakkak (1000)
Wiki information Hakkak:
Ahmad Karimi-Hakkak is a Persian literary figure and Iranist.
Hakkaku is a toshiyori. The name is currently held by former yokozuna Hokutoumi Nobuyoshi. He is correctly addressed as Hakkaku-oyakata.