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Books about Masatsuna:
Catalogue of the Japanese Coin Collection in the British Museum: With Special Reference to Kutsuki Masatsuna (... by Sakuraki Shin'ichi, Nobuhisa Furuta, Shin'ichi Sakuraki and Helen Wang (Dec 31, 2010)
Joho daimyo Kutsuki Masatsuna (Japanese Edition) by Susumu Koide (1994)
The private correspondence of Kutsuki Masatsuna and Isaac Titsingh 1785-1807 by Kutsuki Masatsuna (1992)
Wiki information Masatsuna:
Kutsuki Masatsuna, also known as Kutsuki Oki-no kami Minamoto-no Masatsuna, was a hereditary Japanese daimyo of Oki and Ōmi with holdings in Tamba and Fukuchiyama. His warrior clan was amongst the hereditary vassals of the Tokugawa family in the Edo...