The main factor that means the difference between plagiarism and not-plagiarism is citations! If you are always sure to cite your information, you should never need to worry about getting in trouble for plagiarism.
Fortunately, citation instructions are easy to find, whether you need to use APA, MLA or Chicago style. The library has manuals for each, both on the shelves and at the library's Writing Center. In addition, we have links to some reputable websites where you can also get information.
As an NU student, you have another resource to help with citations: NoodleTools. When you use it to keep track of your sources and notes, it can automatically generate citations in whichever format is required for your assignment. Check out these short videos on how to use this useful source.
Publication Manual of the American Psychological Association by 
MLA Handbook by 
The Chicago Manual of Style by APA Formatting and Style Guide
Purdue Online Writing Lab (OWL)
Frequently Asked Questions About APA Style
American Psychological Association
APA Style Blog
American Psychological Association
MLA Formatting and Style Guide
Purdue Online Writing Lab (OWL)
Works Cited: A Quick Guide
MLA Style Center
Ask the MLA
MLA Style Center
Chicago Style
Purdue Online Writing Lab (OWL)
Chicago Style Citation Quick Guide
The Chicago Manual of Style Online