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Cross Ref

Crossref runs open infrastructure to link research objects, entities, and actions, creating a lasting and reusable scholarly record. As a not-for-profit with over 21,000 members in 160 countries, we drive metadata exchange and support nearly 2 billion monthly API queries, facilitating global research communication, for the benefit of society.

https://www.crossref.org/

Google Scholar

Stand on the shoulders of giants

https://scholar.google.com/

EBSCO

Your source for trusted research content. EBSCO is a leading provider of research databases, e-journal and e-package subscription management, book collection development and acquisition management, and a major provider of library technology, e-books and clinical decision solutions for universities, colleges, hospitals, corporations, government, K12 schools and public libraries worldwide.

https://www.ebsco.com/