Scopus is the largest abstract and citation database of peer-reviewed literature: scientific journals, books and conference proceedings.

Web of Science is an online subscription-based scientific citation indexing service originally produced by the Institute for Scientific Information, now maintained by Clarivate Analytics, that provides a comprehensive citation search

Journal Citation Reports is an annual publication by Clarivate Analytics. It has been integrated with the Web of Science and is accessed from the Web of Science-Core Collections.