The links to some of the e-resources :
1) https://nlist.inflibnet.ac.in/
2) https://ndl.iitkgp.ac.in/
3) https://doaj.org/
4) https://www.doabooks.org/
5) https://www.cambridge.org/
6) https://epgp.inflibnet.ac.in/
7) https://nopr.niscpr.res.in/
8) https://www.jstor.org/
9) https://www.britishcouncil.in/library
10) https://www.nationallibrary.gov.in/
11) https://z-lib.io/
12) https://www.gutenberg.org/