Institutional Repositories DataBase (IRDB) is a database that collects and provides metadata of the contents registered in institutional repositories in Japan.

Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations.

CiNii Books provides holiding information of Japanese academic libraries.

Scopus is the world’s largest abstract and citation database of peer-reviewed literature and quality web sources.

JSTOR offers back numbers of academic journals across the humanities, social sciences, and sciences, as well as select monographs and other materials valuable for academic work.

Wiley Online Library is the ejournal and ebook platform provided by Wiley covering the fields of science and technology, medicine, and the humanities and social sciences.

ScienceDirect is the E-journal and E-book collections produced by Elsevier.

Reference Works are authoritative source of the foundation content researchers need build essential knowledge in their own area of interest and gain cross-disciplinary, comparative perspective in related fields. Available online via ScienceDirect.

ProQuest Dissertations & Theses A&I is the world's most comprehensive collection of doctoral dissertations and master's theses from around the world, spanning from 1861 to the present day.

ProQuest is a integrated search platform of databases and journals.