Directory of Research Journals Indexing I2OR Indexing Services & Evaluation of Publication Impact Factor (PIF) Academic Resource Index ResearchBib Google Scholar Active Search Results Eurasian Scientific Journal Index OpenAIRE Zenodo International Scientific Indexing (ISI) Scientific Indexing Services Cite Factor Academic Scientific Journals scopus ncbi ulakbim CAS Source Index (CASSI) Journament Pubmed Embase EuroPub