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 Academic Search Premier 

 BASE (Bielefeld Academic Search Engine)

 Cambridge University Press

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 DOAB (Directory of Open Access Books) 

 DOAJ (Directory of Open Access Journals)

 Google Scholar

 Hathi Trust Digital Library

 Index Translationum (World Bibliography of Translation)

 JSTOR

 OAIster

 Open Ukrainian Citation Index (OUCI)

 Oxford Academic

 ProQuest Dissertations & Theses Global (PQDT)

 Research4Life 

 Scilit

 Scopus

 Springer eBook collection - Education

 Springer eBooks 2017

 The Free Library

 Web of Science

 Центр учбової літератури