https://www.doabooks.org
https://www.springer.com/gp/open-access/books
https://about.jstor.org/librarians/books/open-access-books-jstor/
https://www.routledge.com/our-products/open-access-books/taylor-francis-oa-books
https://www.palgrave.com/gp/rights-permissions/open
https://www.apress.com/gp/apress-open
https://www.degruyter.com
https://www.cambridge.org/core/services/open-access-policies/open-access-books
https://www.ebsco.com/open-access
https://www.sciencedirect.com/browse/journals-and-books
https://pustaka-digital.kemdikbud.go.id
https://unesdoc.unesco.org