Textbooks or "point of care" summaries are good sources for background information.
Search the Nursing Reference Center to see if there is an Evidence-Based Care Sheet available for the topic. These are "point of care" summaries.
Example: Medication Errors-Inappropriate Prescribing of Antibiotics
Search for scholarly articles in the following databases:
The Cochrane Library Reference Guide:
http://www.workcast.com/ControlUsher.aspx?cpak=9621168547619827&pak=5334253650203132
​Several videos about how to search the Cochrane Library.