Science Citation Index Expanded - Clarivate Analytics
Provides abstracts, cited references, times cited, and links to full text when available for articles in the sciences (1975 to present). Part of Web of Science.
MEDLINE (ProQuest) - ProQuest
Citations and abstracts to medical literature including clinical medicine, nursing, dentistry, allied health, health care services and administration, biological and physical sciences, etc. Coverage: 1996 to present.
ScienceDirect - Elsevier
Full-text articles from Elsevier journals covering all subject areas. Particular emphasis on scientific, technical and medical information.