Analysis of information sources in references of the Wikipedia article "Tachibana Dōsetsu" in English language version.
Chapter 4: Buzen Province during the Sengoku Period (2) Conflict between the Otomo clan and the Mori clan, the attack and defense of Matsuyama Castle (Ura Bunshi, Hagi Clan Sect Record)
Bekki Dōsetsu , secured Sōrin's approval to give his only daughter