CINAHL is a great place to start evidence-based nursing research. It offers access to academic/peer-reviewed/scholarly journal articles, health care books, nursing dissertations, selected conference proceedings, standards of practice, educational software, audiovisuals and book chapters, as well as Evidence-Based Care Sheet.
The Cochrane Library is a collection of six databases, including: Cochrane Database of Systematic Reviews (CDSR), Cochrane Central Register of Controlled Trials (CENTRAL), Cochrane Methodology Register (CMR), Database of Abstracts of Reviews of Effects (DARE), Health Technology Assessment Database (HTA), and NHS Economic Evaluation Database (EED).
Health & Psychosocial Instruments (HaPI), produced by Behavioral Measurement Database Services, is a comprehensive bibliographic database providing information about behavioral measurement instruments.
Health Source: Nursing/Academic Edition provides nearly 550 scholarly full text journals, including nearly 450 peer-reviewed journals focusing on many medical disciplines. Also featured are abstracts and indexing for nearly 850 journals.
MEDLINE indexes the international literature on biomedicine, including the allied health fields and the biological and physical sciences, humanities, and information science as they relate to medicine and health care.