There are many reasons why it is important to cite the resources that you consult when researching a paper. The most important of these are:
Copyright grants a set of exclusive rights to creators, which means that no one else can copy, distribute, perform, adapt or otherwise use the work in violation of those exclusive rights. This gives creators the means to control the use of their works by others, thereby incentivizing them to create new works in the first place.
The person who controls the rights, however, may not always be the author. It is important to understand who controls the exclusive rights granted by copyright in order to understand who has authority to grant permissions to others to reuse the work.
"To represent oneself as the author of some work that is in fact the work of someone else is to plagiarize. Plagiarism may include the 'passing off' of the form of the work—for example, the exact words of a piece of writing—or the intellectual content, or both" (Pickering).
Plagiarizing, whether intentional or by accident, is a violation of the Intellectual Property Policy in the Student Handbook page 60 .
Learn More about Plagiarism
Remember, if you use someone else's ideas and/or quote their words you must give them credit.
MLA Style: "The in-text citation in your text makes clear to your reader what you took from a source and where in the source you found the information" (Bullock 112).
APA Style: "The in-text citation in your text makes clear to your reader what you took from a source and where in the source you found the information" (Bullock, 2018, p. 112).
Turabian: "The in-text citation in your text makes clear to your reader what you took from a source and where in the source you found the information."1
Paraphrasing uses the key ideas from other sources, but these ideas are put in your own words. Because the idea is the source's, you still should cite the source with a proper citation.
For more information:
Why do I need to cite my sources?
Source: Why citations matter. (n.d.) http://library.uvm.edu/guides/citation/why.php