Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) ISEKI Takahiro,Bundled license model for e-textbooks tried in university classes: Aiming for an ecosystem of universities and publishers,Dejitaru Akaibu Gakkaishi,2432-9762,Japan Society for Digital Archive,2023,7,2,e11-e17,https://cir.nii.ac.jp/crid/1390858463932480384,https://doi.org/10.24506/jsda.7.2_e11