Open Access E- Book

1. Directory of Open Access Book   https://www.doabooks.org/
2.  National Academic Press        https://nap.nationalacademies.org/
3.  Book Boon   https://bookboon.com/
4. PROJECT GUTENBERG   https://www.gutenberg.org/
5. OPEN TEXT BOOK LIBRARY  https://open.umn.edu/opentextbooks/
6. OPEN ACCESS BOOKS ON JSTORE  https://www.jstor.org/
7. SPRINGER OPEN ACCESS BOOKS https://link.springer.com/search?package=openaccess&facet-content-type=%22Book%22&utm_source=springer&utm_medium=referral&utm_content=RMarketing&utm_campaign=BBKK_4_CE02_SpringerOABhometoSL
8. CAMBRIDGE UNIVERSITY PRESS https://www.cambridge.org/core/open-research/open-access
9. Internet Archive  https://archive.org/
10.  E-BOOKS & GUIDELINES OF UGC: https://www.ugc.gov.in/publication/ebook

 OPEN LIBRARY https://openlibrary.org/