| SN | Database | URL |
| 1 | Cambridge University Press | https://www.cambridge.org/core |
| 2 | EBSCOhost | https://search.ebscohost.com/ |
| 3 | IEEE | https://ieeexplore.ieee.org/Xplore/home.jsp |
| 4 | Project MUSE online | https://muse.jhu.edu/ |
| 5 | Taylor & Francis | https://www.tandfonline.com/ |
| 6 | Wiley–Interscience | https://onlinelibrary.wiley.com/ |