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UNC Writing Center gives a brief description of citations and why they are necessary.
If you don't cite your sources properly, you are plagiarizing. Not only will this negatively impact your grade, but it's a violation of the Academic Integrity Code outlined in your Student Handbook.
Plagiarism is intentionally or knowingly presenting the work of another as one’s own (i.e., without proper acknowledgment of the source). The sole exception to the requirement of acknowledging sources is when the ideas, information, etc., are common knowledge.
(Source: Merriam-Webster Dictionary)
Some examples of plagiarism include: