Sources

Sources

Dictionaries and encyclopaedias

1. 摂津守初代忠行 (Settsu no Kami shodai Tadayuki), Japanese Wikipedia
2. 一竿子忠綱 (Ikkanshi Tadatsuna), Japanese Wikipedia
3. 初代忠行 (Shodai Tadayuki), the one of Hizen, Japanese Wikipedia
4. 日本刀 (nihontō), Japanese Wikipedia

Lists and treatises

1. 刀剣の業物一覧 (Tōken no wazamono ichiran), Japanese Wikipedia
2. List of Wazamono, English Wikipedia
3. Japanese Sword Index: Tomita Kiyama’s ranking of shintō smiths, translated by Jinsoo Kim