Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Koshoji Toshiyasu,The Introduction of the Behind-bars Letter from the Ichigaya Prison of SAKAI Toshihiko in the First Japanese Communist Party case,キリスト教社会問題研究,04503139,同志社大学人文科学研究所,2010-01-25,,58,133-149,https://cir.nii.ac.jp/crid/1390572174866732928,https://doi.org/10.14988/pa.2017.0000011913