On writing literature reviews

http://www.writing.utoronto.ca/advice/specific-types-of-writing/literature-review

Online encyclopaedias

http://www.britannica.com/
http://www.wikepedia.org/

General databases

http://scholar.google.co.uk/

Working papers:

http://www.cepr.org/
http://www.nber.org/papers/
http://papers.ssrn.com/

Deeper Insight: Links on meta-analysis

http://mason.gmu.edu/~dwilsonb/ma.html
http://www.psychologytoday.com/blog/the-procrastination-equation

Deeper Insight: Links on web search strategies:

http://www.learnwebskills.com