When deciding whether to cite or not to cite, ask yourself:
Is this my own idea?
Or have I simply reworded someone else's ideas, thoughts, or research?
Don't forget, paraphrased passages need to be cited.
Are these all my own original words?
Or am I using a distinctive term or phrase coined by another?
Distinctive words and phrases that are not original need to be in quotation marks and cited.
Is this a direct quote?
Or has this been paraphrased and put into my own words?
If you are using the exact words from your source, use quotation marks and cite.
Paraphrased passages also need to be cited but are not enclosed in quotation marks.
This should cover most situations, but for more information see:
"What is Plagiarism" The Honor Council Georgetown University
Tip: When in doubt, it is better to cite than not to cite.