- Cabell's Directories
- Dialnet
- DBLP
- DOAJ - Directory of Open Access Journals
- REDIB - Red Iberoamericana de Innovación y Conocimiento Científico
- EBSCO - Applied Science & Technology Source
- GALE Cengage Learning
- Google Scholar
- INSPEC - IET
- ICI Journals Master List
- ICI World of Journals
- LATINDEX
- MIAR
- PUBLINDEX
- REBIUN - Red de Bibliotecas Universitarias
- RESEARCHGATE
- SCIE - Science Citation Index Expanded - Clarivate Analytics
- Scopus
- WORLDCAT
Other indexes / Databases:
Academic Journals Database, Standford University (Libraries & Academic information resources), Ulrichs Web: The Global Source for Periodicals, NewJour. Georgetown University, National Library of Australia, HKU Libraries, OAK List DataBase of Queensland University of Technology (Brisbane Australia), University of Tsukuba Library (Japan), State Library of Kansas, Chinese Culture Library, Cleveland State University, Uottawwa Library, University of York, Biblioteca Universia, Dulcinea