REGARDING RESEARCH AND SOURCES IN GENERAL:
Critically Analyzing Information Sources. Cornell University Library.
When doing research, how do I know that the information I've found is reliable?
Citing Sources. Vanderbilt University Library.
What does and doesn't need to be cited?
What is plagiarism? How can I avoid it?. Vanderbilt University Honor Council.
Forms of plagiarism with illustrative examples.
REGARDING THE USE OF ONLINE SOURCES :
Evaluating Web Pages. UC Berkeley Library.
Techniques to apply and questions to ask when trying to figure out if a web page is a good and legitimate research source.
Web Site Evaluation Worksheet. Vanderbilt University Library.
A nifty worksheet (pdf format) that helps one evaluate the research merits of a web site.