1. Alexander Street Press https://alexanderstreet.com/
2. Brill Online https://brill.com/
3. Cambridge University Press https://search-study-uk.britishcouncil.org
4. Cengage Learning https://www.cengageasia.com/
5. Ebsco https://www.ebsco.com/academic-libraries
6. IGI Global https://www.igi-global.com/journals/
7. IG Publishing https://www.igpublish.com/ebook-platform/
8. IJISRT https://www.ijisrt.com/
9. Lexis Nexis https://www.lexisnexis.com/en-us/home.page
10. Proquest https://about.proquest.com/en/
11. Sage Knowledge https://sk.sagepub.com/
12. Taylor & Francis https://www.tandfonline.com/
13. Ulrichs Periodicals Directory https://www.library.ucsb.edu/research/db/338
