List of Feudal Lords Returning to Chugoku in September, Keio, the Year of Tiger

Letter from Sakamoto Ryoma to Sakamoto Gonbei on the 9th Day of the10th Month of Keio 3 (1867)

Kyoto National Museum

Integrated Collections Database of the National Museums, Japan

Letter from Sakamoto Ryoma to his Sister Otome in the First Half of the 4th Month of Keio 3 (1867)

Kyoto National Museum

Integrated Collections Database of the National Museums, Japan

Famous Views of Annual Events in the Eastern Capital: Ninth Month, Three Shrines of Kanda Festival

Edo-Tokyo Museum

Tokyo Museum Collection