Library Genesis. Sci-Hub: removing barriers in the way of science. Education Resources Information Center. RefSeek - Academic Search Engine. Questia, Your Online Research Library. After many years of successfully serving the needs of our customers, HighBeam Research has been retired. Because HighBeam Research has closed down we have taken you to our sister website Questia, an award-winning Cengage Learning product. Located in downtown Chicago, Questia is the premier online research and paper writing resource.
El acceso abierto. Collections. Directory of Open Access Repositories - v2.sherpa. Welcome to the Registry of Open Access Repositories - Registry of Open Access Repositories. DULCINEA 2018. DULCINEA. MDPI - Publisher of Open Access Journals. SHERPA/RoMEO - Publisher copyright policies & self-archiving. SEDICI - Repository of National University of La Plata. SciELO.org. Latindex. ColeccionHome. Home. REMERI - Red Mexicana de Repositorios Institucionales. OECD iLibrary.