Citation Index 
Name Publisher URL Address Details Access
Elsevier http://www.scopus.com Life Sciences, Health Sciences, Engineering, Physical Sciences and Social Science Access to Author serch & sources
Clarivate Analytics  (WOS)ISI Science, Social Science, Art & Humanities Yes
Google https://scholar.google.com Provides a simple way to broadly search for scholarly literature. Search across peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Free
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